From 688cd87004569c122bf19c127699c5b034492528 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jean-Philippe=20Bruy=C3=A8re?= <jp_bruyere@hotmail.com>
Date: Tue, 13 Feb 2018 06:53:18 +0100
Subject: [PATCH] CrowIDE, ObservableList, include Crow.Coding

---
 Crow.csproj                                   |  8 +-
 Crow.sln                                      | 35 ++++++---
 Default.style                                 |  2 +-
 Templates/ColorPicker.template                |  2 +-
 Templates/Spinner.template                    | 16 ++--
 Tests/BasicTests.cs                           |  6 +-
 Tests/CrowWindow.cs                           |  9 ++-
 Tests/Interfaces/TabItem.template             | 22 ++++++
 .../TemplatedContainer/testTabView.crow       |  8 +-
 .../TemplatedControl/testSpinner.crow         |  1 +
 Tests/Tests.csproj                            | 17 +++-
 src/GraphicObjects/GraphicObject.cs           |  7 +-
 src/GraphicObjects/Group.cs                   | 14 +++-
 src/GraphicObjects/IMLContainer.cs            | 50 ++++++++++++
 src/GraphicObjects/MDIContainer.cs            | 40 ++++++++++
 src/GraphicObjects/MessageBox.cs              |  4 +-
 src/GraphicObjects/PrivateContainer.cs        |  3 +-
 src/GraphicObjects/TabItem.cs                 | 54 ++++++++-----
 src/GraphicObjects/TabView.cs                 | 77 +++++++++++--------
 src/GraphicObjects/TemplatedGroup.cs          | 37 ++++++++-
 src/IListChanged.cs                           | 43 +++++++++++
 src/Instantiator.cs                           | 24 ++++--
 src/Interface.cs                              | 14 ++--
 src/ObservableList.cs                         | 46 +++++++++++
 24 files changed, 437 insertions(+), 102 deletions(-)
 create mode 100644 Tests/Interfaces/TabItem.template
 create mode 100644 src/GraphicObjects/IMLContainer.cs
 create mode 100644 src/GraphicObjects/MDIContainer.cs
 create mode 100644 src/IListChanged.cs
 create mode 100644 src/ObservableList.cs

diff --git a/Crow.csproj b/Crow.csproj
index a8b47dc8..4de640dd 100644
--- a/Crow.csproj
+++ b/Crow.csproj
@@ -30,12 +30,14 @@
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
-    <DefineConstants>DEBUG_UPDATE0;DEBUG_FOCUS0;DEBUG_LAYOUTING0;TRACE0;DEBUG;MEASURE_TIME;DEBUG_LOAD0;DEBUG_BINDING0;DEBUG_CLIP_RECTANGLE0</DefineConstants>
+    <DefineConstants>DEBUG_UPDATE0;DEBUG_FOCUS0;DEBUG_LAYOUTING0;TRACE0;DEBUG;MEASURE_TIME;DEBUG_LOAD0;DEBUG_BINDING;DEBUG_CLIP_RECTANGLE0</DefineConstants>
     <Optimize>false</Optimize>
+    <OutputPath>$(SolutionDir)build\Debug</OutputPath>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <Optimize>true</Optimize>
     <DefineConstants>__linux__</DefineConstants>
+    <OutputPath>$(SolutionDir)build\Release</OutputPath>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="src\Colors.cs" />
@@ -213,6 +215,10 @@
     <Compile Include="src\IML\IMLContext.cs" />
     <Compile Include="src\Mono.Cairo\MeshPattern.cs" />
     <Compile Include="src\GraphicObjects\Shape.cs" />
+    <Compile Include="src\GraphicObjects\MDIContainer.cs" />
+    <Compile Include="src\IListChanged.cs" />
+    <Compile Include="src\ObservableList.cs" />
+    <Compile Include="src\GraphicObjects\IMLContainer.cs" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/Crow.sln b/Crow.sln
index 5fc9079f..61aaa3af 100644
--- a/Crow.sln
+++ b/Crow.sln
@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Crow.Test", "Crow.Test\Crow
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CrowIDE", "CrowIDE\CrowIDE.csproj", "{B6D911CD-1D09-42FC-B300-9187190F2AE1}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Crow.Coding", "..\gts\CrowEdit\Crow.Coding\Crow.Coding.csproj", "{78842EE4-8A2F-4C75-AEC6-C95F15AD3994}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -22,32 +24,46 @@ Global
 		{74289092-9F70-4941-AFCB-DFD7BE2140B6}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{74289092-9F70-4941-AFCB-DFD7BE2140B6}.Release|Any CPU.Build.0 = Release|Any CPU
 		{B6D911CD-1D09-42FC-B300-9187190F2AE1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B6D911CD-1D09-42FC-B300-9187190F2AE1}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B6D911CD-1D09-42FC-B300-9187190F2AE1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B6D911CD-1D09-42FC-B300-9187190F2AE1}.Release|Any CPU.Build.0 = Release|Any CPU
 		{C2980F9B-4798-4C05-99E2-E174810F7C7B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{C2980F9B-4798-4C05-99E2-E174810F7C7B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{C2980F9B-4798-4C05-99E2-E174810F7C7B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{C2980F9B-4798-4C05-99E2-E174810F7C7B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{78842EE4-8A2F-4C75-AEC6-C95F15AD3994}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{78842EE4-8A2F-4C75-AEC6-C95F15AD3994}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{78842EE4-8A2F-4C75-AEC6-C95F15AD3994}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{78842EE4-8A2F-4C75-AEC6-C95F15AD3994}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(MonoDevelopProperties) = preSolution
 		Policies = $0
 		$0.StandardHeader = $1
 		$1.Text = @\n${FileName}\n \nAuthor:\n      ${AuthorName} <${AuthorEmail}>\n\nCopyright (c) 2013-2017 Jean-Philippe Bruyère\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the "Software"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in\nall copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\nTHE SOFTWARE.
-		$1.IncludeInNewFiles = True
 		$0.DotNetNamingPolicy = $2
-		$2.DirectoryNamespaceAssociation = None
-		$2.ResourceNamePolicy = FileFormatDefault
 		$0.TextStylePolicy = $3
-		$3.FileWidth = 120
-		$3.TabsToSpaces = False
 		$3.EolMarker = Unix
-		$3.inheritsSet = VisualStudio
-		$3.inheritsScope = text/plain
 		$3.scope = text/x-csharp
 		$0.CSharpFormattingPolicy = $4
 		$4.AfterDelegateDeclarationParameterComma = True
-		$4.inheritsSet = Mono
-		$4.inheritsScope = text/x-csharp
 		$4.scope = text/x-csharp
+		$4.IndentSwitchSection = False
+		$4.NewLinesForBracesInProperties = False
+		$4.NewLinesForBracesInAccessors = False
+		$4.NewLinesForBracesInAnonymousMethods = False
+		$4.NewLinesForBracesInControlBlocks = False
+		$4.NewLinesForBracesInAnonymousTypes = False
+		$4.NewLinesForBracesInObjectCollectionArrayInitializers = False
+		$4.NewLinesForBracesInLambdaExpressionBody = False
+		$4.NewLineForElse = False
+		$4.NewLineForCatch = False
+		$4.NewLineForFinally = False
+		$4.NewLineForMembersInObjectInit = False
+		$4.NewLineForMembersInAnonymousTypes = False
+		$4.NewLineForClausesInQuery = False
+		$4.SpacingAfterMethodDeclarationName = True
+		$4.SpaceAfterMethodCallName = True
+		$4.SpaceBeforeOpenSquareBracket = True
 		$0.VersionControlPolicy = $5
 		$5.CommitMessageStyle = $6
 		$6.Indent = @\t
@@ -55,7 +71,6 @@ Global
 		$6.LastFilePostfix = "@:\n  "
 		$6.LineAlign = 0
 		$6.Wrap = False
-		$5.inheritsSet = Mono
 		description = @C.R.O.W. c# Rapid Open Widgets\n\nCrow is a pure c# widget toolkit with XML definition of interface, bindings, styling...\n
 		version = 0.5
 	EndGlobalSection
diff --git a/Default.style b/Default.style
index c5c04ea7..9a0f3f54 100644
--- a/Default.style
+++ b/Default.style
@@ -157,7 +157,7 @@ ArrowBut {
 	Focusable=true;
 	Foreground=Jet;
 	Background=hgradient|0:Gray|1:Jet;
-	MouseDown={Background=hgradient|0:White|0.2:BlueCrayola|1:Jet};
+	MouseDown={Background=hgradient|0:White|0.4:BlueCrayola|1:Jet};
 	MouseUp={Background=hgradient|0:Gray|1:Jet};
 	MouseEnter={Foreground=Black};
 	MouseLeave={Foreground=Jet};
diff --git a/Templates/ColorPicker.template b/Templates/ColorPicker.template
index d6bda346..f626bfea 100755
--- a/Templates/ColorPicker.template
+++ b/Templates/ColorPicker.template
@@ -8,7 +8,7 @@
 					Width="128" Height="128"/>
 				<HueSelector Hue="{²./H}" Focusable="true" Name="hueSelector" Margin="0" Width="128" Height="20"/>
 			</VerticalStack>
-			<VerticalStack Margin="5" Spacing="0">
+			<VerticalStack Margin="5" Spacing="1">
 				<GraphicObject Width="34" Height="21" Background="{./SelectedColor}"/>
 				<Label Focusable="true" Selectable="true" Width="Stretched" Text="{./HexColor}" />				
 				<HorizontalStack Height="Fit">
diff --git a/Templates/Spinner.template b/Templates/Spinner.template
index de1a4d82..dd957d25 100755
--- a/Templates/Spinner.template
+++ b/Templates/Spinner.template
@@ -1,18 +1,12 @@
 <?xml version="1.0"?>
-<HorizontalStack MinimumSize="40,10" Name="hstack" Margin="0" Spacing="0">
-	<Border BorderWidth="1" Width="80%"  Background="White" 
+<HorizontalStack MinimumSize="40,13" Name="hstack" Margin="0" Spacing="0">
+	<Border BorderWidth="1" Width="75%"  Background="White" 
 		Foreground="{./Foreground}" Margin="0">
 		<TextBox Foreground="{./Foreground}" Font="{./Font}" Width="Stretched"
 			Text="{²./Value}" TextAlignment="Right" Margin="0"/>
 	</Border>
-	<VerticalStack MinimumSize="8,10" Width="20%" Height="Stretched" Spacing="0" Margin="0" Background="Red">
-		<Button MouseRepeat="true" Width="Stretched" Height="50%" Margin="0" MouseClick="./onUp"
-			Template="#Crow.Templates.ArrowBut.template">
-			<Image Path="#Crow.Images.Icons.updown.svg" SvgSub="up" Margin="0"/>
-		</Button>				
-		<Button MouseRepeat="true" Width="Stretched" Height="50%" Margin="0" MouseClick="./onDown" 
-			Template="#Crow.Templates.ArrowBut.template">
-			<Image Path="#Crow.Images.Icons.updown.svg" SvgSub="down" Margin="0"/>
-		</Button>
+	<VerticalStack MinimumSize="13,13" Width="25%" Height="Stretched" Spacing="0" Margin="0">
+		<Shape Style="ArrowBut"	Height="50%" MouseClick="./onUp" Path="M 5.5,0.5 L 10.5,6.5 L 0.5,6.5 Z"/>			
+		<Shape Style="ArrowBut"	Height="50%" MouseClick="./onDown" Path="M 0.5,0.5 L 10.5,0.5 L 5.5,6.5 Z"/>			
 	</VerticalStack>
 </HorizontalStack>
diff --git a/Tests/BasicTests.cs b/Tests/BasicTests.cs
index e04f160e..a33470b0 100644
--- a/Tests/BasicTests.cs
+++ b/Tests/BasicTests.cs
@@ -143,7 +143,9 @@ namespace Tests
 
 			//testFiles = new string [] { @"Interfaces/Unsorted/testFileDialog.crow" };
 			//testFiles = new string [] { @"Interfaces/Divers/colorPicker.crow" };
-			testFiles = new string [] { @"Interfaces/Divers/welcome.crow" };
+			//testFiles = new string [] { @"Interfaces/Divers/welcome.crow" };
+			//testFiles = new string [] { @"Interfaces/TemplatedContainer/testTabView.crow" };
+			testFiles = new string [] { @"Interfaces/TemplatedControl/testSpinner.crow" };
 			testFiles = testFiles.Concat (Directory.GetFiles (@"Interfaces/GraphicObject", "*.crow")).ToArray ();
 			testFiles = testFiles.Concat (Directory.GetFiles (@"Interfaces/Container", "*.crow")).ToArray ();
 			testFiles = testFiles.Concat (Directory.GetFiles (@"Interfaces/Group", "*.crow")).ToArray ();
@@ -203,7 +205,7 @@ namespace Tests
 				GraphicObject obj = Load (testFiles[idx]);
 				obj.DataSource = this;
 			} catch (Exception ex) {				
-				MessageBox.Show (MessageBox.Type.Error, ex.Message + "\n" + ex.InnerException);
+				MessageBox.Show (CurrentInterface, MessageBox.Type.Error, ex.Message + "\n" + ex.InnerException);
 			}
 		}
 //		void Tv_SelectedItemChanged (object sender, SelectionChangeEventArgs e)
diff --git a/Tests/CrowWindow.cs b/Tests/CrowWindow.cs
index 9a0c4df0..8ce0abb3 100644
--- a/Tests/CrowWindow.cs
+++ b/Tests/CrowWindow.cs
@@ -200,10 +200,13 @@ namespace Crow
 			addInterfaceControler (tmp);
 			return tmp;
 		}
+		public GraphicObject AddWidget (string path)
+		{			
+			GraphicObject tmp = Load (path);
+			return tmp;
+		}
 		public GraphicObject AddWidget (GraphicObject g, int interfaceIdx = 0){
-			if (ifaceControl.Count == 0)//create default orthogonal interface
-				addInterfaceControler (new InterfaceControler (
-					new Rectangle (0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height)));
+			checkDefaultIFace ();
 			ifaceControl [interfaceIdx].CrowInterface.AddWidget (g);
 			return g;
 		}
diff --git a/Tests/Interfaces/TabItem.template b/Tests/Interfaces/TabItem.template
new file mode 100644
index 00000000..3691a2d0
--- /dev/null
+++ b/Tests/Interfaces/TabItem.template
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<GenericStack Orientation="Vertical" Spacing="0"
+		Background="Onyx"
+		MouseEnter="{caption.Foreground=White}"
+		MouseLeave="{caption.Foreground=Gray}">
+	<HorizontalStack Margin="2" Left="{./TabOffset}"
+		Name="TabTitle"
+		HorizontalAlignment="Left"
+		Height="{./TabThickness}"
+		Width="Fit">
+		<Label Name="caption" Text="{./Caption}" Foreground="Gray"/>
+		<Label Text="{./ViewIndex}" Foreground="Green"/>
+		<Label Text="{./TabOffset}" Foreground="Red"/>
+		<Border CornerRadius="5" BorderWidth="1" Foreground="Transparent"  Height="12" Width="12"
+					MouseEnter="{Foreground=White}" MouseLeave="{Foreground=Transparent}">
+			<Image Focusable="true" Name="Image" Margin="0" Width="Stretched" Height="Stretched" Path="#Crow.Images.Icons.exit2.svg"
+				 MouseClick="./butCloseTabClick"/>
+		</Border>
+	</HorizontalStack>
+	<Container Name="Content"/>
+</GenericStack>
+
diff --git a/Tests/Interfaces/TemplatedContainer/testTabView.crow b/Tests/Interfaces/TemplatedContainer/testTabView.crow
index fa33318b..63c898d9 100644
--- a/Tests/Interfaces/TemplatedContainer/testTabView.crow
+++ b/Tests/Interfaces/TemplatedContainer/testTabView.crow
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <VerticalStack Height="50%" Width="80%">
+	<HorizontalStack Height="Fit">
+		<Label Text="Selected Tab:"/>
+		<Label Text="{../../tabview1.SelectedTab}"/>
+	</HorizontalStack>
 	<TabView Name="tabview1" Orientation="Horizontal" Spacing="24">
 		<TabItem Name="TabItem1" Caption="tab item 1">
 			<VerticalStack Margin="20">
@@ -17,12 +21,12 @@
 				<RadioButton/>
 			</VerticalStack>
 		</TabItem>
-		<TabItem Name="TabItem2" Caption="tab item 3" Background="Gray">
+		<TabItem Name="TabItem3" Caption="tab item 3" Background="Gray">
 			<Container Margin="5" CornerRadius="2" >
 				<TextBox Margin="5" Multiline="true" TextAlignment="TopLeft"/>
 			</Container>
 		</TabItem>
-		<TabItem Name="TabItem2" Caption="tab item 4" Margin="0" Background="Gray">
+		<TabItem Name="TabItem4" Caption="tab item 4" Margin="0" Background="Gray">
 			<TextBox/>
 		</TabItem>
 	</TabView>
diff --git a/Tests/Interfaces/TemplatedControl/testSpinner.crow b/Tests/Interfaces/TemplatedControl/testSpinner.crow
index 4efd587a..09f618be 100755
--- a/Tests/Interfaces/TemplatedControl/testSpinner.crow
+++ b/Tests/Interfaces/TemplatedControl/testSpinner.crow
@@ -8,4 +8,5 @@
 		<Spinner Value="5"/>
 		<Button/>
 	</HorizontalStack>
+	<IMLContainer Path="Interfaces/Divers/colorPicker.crow"/>
 </VerticalStack>
\ No newline at end of file
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index 7fd3f6ed..5016b0ee 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -8,7 +8,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>Tests</RootNamespace>
     <AssemblyName>Tests</AssemblyName>
-    <StartupObject>Tests.Showcase</StartupObject>
+    <StartupObject>Tests.BasicTests</StartupObject>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ReleaseVersion>0.5</ReleaseVersion>
@@ -63,6 +63,18 @@
     <StartWorkingDirectory>%24{SolutionDir}\build\%24{ProjectConfigName}</StartWorkingDirectory>
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(RunConfiguration)' == 'Custom Command' ">
+    <StartAction>Program</StartAction>
+    <StartProgram>%24{TargetName}</StartProgram>
+    <StartWorkingDirectory>%24{SolutionDir}\build\%24{ProjectConfigName}</StartWorkingDirectory>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(RunConfiguration)' == 'Custom Command' ">
+    <StartAction>Program</StartAction>
+    <StartProgram>%24{TargetName}</StartProgram>
+    <StartWorkingDirectory>%24{SolutionDir}\build\%24{ProjectConfigName}</StartWorkingDirectory>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Data" />
@@ -390,6 +402,9 @@
     <EmbeddedResource Include="Tutorials\test.crow">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </EmbeddedResource>
+    <EmbeddedResource Include="Interfaces\TabItem.template">
+      <LogicalName>Crow.TabItem.template</LogicalName>
+    </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Crow.csproj">
diff --git a/src/GraphicObjects/GraphicObject.cs b/src/GraphicObjects/GraphicObject.cs
index e24e9b28..6ec60cf3 100644
--- a/src/GraphicObjects/GraphicObject.cs
+++ b/src/GraphicObjects/GraphicObject.cs
@@ -363,6 +363,11 @@ namespace Crow
 				this.RegisterForRedraw ();
 			}
 		}
+		#if DEBUG
+		[XmlIgnore]public string TreePath {
+			get { return this.GetType().Name + uid.ToString ();	}
+		}
+		#endif
 		/// <summary>
 		/// Name is used in binding to reference other GraphicObjects inside the graphic tree
 		/// and by template controls to find special element in their template implementation such
@@ -785,7 +790,7 @@ namespace Crow
 				OnDataSourceChanged (this, e);
 		}
 		internal bool localDataSourceIsNull { get { return dataSource == null; } }
-		internal bool localLogicalParentIsNull { get { return logicalParent == null; } }
+		public bool localLogicalParentIsNull { get { return logicalParent == null; } }
 
 		public virtual void OnDataSourceChanged(object sender, DataSourceChangeEventArgs e){
 			DataSourceChanged.Raise (this, e);
diff --git a/src/GraphicObjects/Group.cs b/src/GraphicObjects/Group.cs
index a940ee7e..c944eba2 100644
--- a/src/GraphicObjects/Group.cs
+++ b/src/GraphicObjects/Group.cs
@@ -38,7 +38,7 @@ namespace Crow
 	public class Group : GraphicObject
     {
 		#region CTOR
-		protected Group () : base(){}
+		public Group () : base() {}
 		public Group(Interface iface) : base(iface){}
 		#endregion
 
@@ -90,6 +90,18 @@ namespace Crow
 
 			this.RegisterForLayouting (LayoutingType.Sizing | LayoutingType.ArrangeChildren);
         }
+		public virtual void InsertChild (int idx, GraphicObject g) {
+			lock (children) {
+				g.Parent = this;
+				Children.Insert (idx, g);
+			}
+			g.RegisteredLayoutings = LayoutingType.None;
+			g.LayoutChanged += OnChildLayoutChanges;
+			g.RegisterForLayouting (LayoutingType.Sizing | LayoutingType.ArrangeChildren);
+		}
+		public virtual void RemoveChild (int idx) {
+			RemoveChild (children[idx]);
+		}
 		public virtual void ClearChildren()
 		{
 			lock (children) {
diff --git a/src/GraphicObjects/IMLContainer.cs b/src/GraphicObjects/IMLContainer.cs
new file mode 100644
index 00000000..a221a78b
--- /dev/null
+++ b/src/GraphicObjects/IMLContainer.cs
@@ -0,0 +1,50 @@
+//
+// IMLContainer.cs
+//
+// Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// Copyright (c) 2013-2017 Jean-Philippe Bruyère
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Crow
+{
+	public class IMLContainer : PrivateContainer
+	{
+		public IMLContainer () : base()
+		{
+		}
+
+		string path;
+
+		public string Path {
+			get { return path; }
+			set {
+				if (path == value)
+					return;
+				path = value;
+				this.SetChild (CurrentInterface.Load (path));
+				NotifyValueChanged ("Path", path);
+			}
+		}
+	}
+}
+
diff --git a/src/GraphicObjects/MDIContainer.cs b/src/GraphicObjects/MDIContainer.cs
new file mode 100644
index 00000000..d8ce4647
--- /dev/null
+++ b/src/GraphicObjects/MDIContainer.cs
@@ -0,0 +1,40 @@
+//
+// MDIContainer.cs
+//
+// Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// Copyright (c) 2013-2017 Jean-Philippe Bruyère
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Crow
+{
+	public class MDIContainer : Group
+	{
+		#region CTOR
+		public MDIContainer () : base()
+		{
+		}
+		#endregion
+
+	}
+}
+
diff --git a/src/GraphicObjects/MessageBox.cs b/src/GraphicObjects/MessageBox.cs
index 7f945810..e1c8cc87 100644
--- a/src/GraphicObjects/MessageBox.cs
+++ b/src/GraphicObjects/MessageBox.cs
@@ -134,9 +134,9 @@ namespace Crow
 			Cancel.Raise (this, null);
 			close ();
 		}
-		public static MessageBox Show (Type msgBoxType, string message, string okMsg = "", string cancelMsg = ""){
+		public static MessageBox Show (Interface iface, Type msgBoxType, string message, string okMsg = "", string cancelMsg = ""){
 			//lock (Interface.CurrentInterface.UpdateMutex) {
-				MessageBox mb = new MessageBox (Interface.CurrentInterface);
+				MessageBox mb = new MessageBox (iface);
 				mb.CurrentInterface.AddWidget (mb);
 				mb.MsgType = msgBoxType;
 				mb.Message = message;
diff --git a/src/GraphicObjects/PrivateContainer.cs b/src/GraphicObjects/PrivateContainer.cs
index 5ee29e94..e76b57a8 100644
--- a/src/GraphicObjects/PrivateContainer.cs
+++ b/src/GraphicObjects/PrivateContainer.cs
@@ -47,7 +47,7 @@ namespace Crow
 
 		protected GraphicObject child;
 
-		internal virtual void SetChild(GraphicObject _child)
+		protected virtual void SetChild(GraphicObject _child)
 		{
 
 			if (child != null) {
@@ -204,6 +204,7 @@ namespace Crow
 		public override void checkHoverWidget (MouseMoveEventArgs e)
 		{
 			base.checkHoverWidget (e);
+
 			if (child != null) 
 				if (child.MouseIsIn (e.Position)) 
 					child.checkHoverWidget (e);
diff --git a/src/GraphicObjects/TabItem.cs b/src/GraphicObjects/TabItem.cs
index b35c544c..d811ea54 100644
--- a/src/GraphicObjects/TabItem.cs
+++ b/src/GraphicObjects/TabItem.cs
@@ -29,6 +29,7 @@ using System.Xml.Serialization;
 using System.ComponentModel;
 using System.Diagnostics;
 using Cairo;
+using System.Linq;
 
 namespace Crow
 {
@@ -39,6 +40,8 @@ namespace Crow
 		public TabItem (Interface iface) : base(iface){}
 		#endregion
 
+		public event EventHandler QueryClose;
+
 		#region Private fields
 		GraphicObject titleWidget;
 		int tabOffset;
@@ -70,6 +73,21 @@ namespace Crow
 		internal GraphicObject TabTitle { get { return titleWidget; }}
 		#endregion
 
+		/// <summary>
+		/// order of redrawing, items can't be reordered in TemplatedGroup due to data linked, so we need another index
+		/// instead of children list order
+		/// </summary>
+		public int viewIndex = 0;
+		public virtual int ViewIndex {
+			get { return viewIndex; }
+			set {
+				if (viewIndex == value)
+					return;
+				viewIndex = value;
+				NotifyValueChanged ("ViewIndex", viewIndex);
+			}
+		}
+
 		[XmlAttributeAttribute][DefaultValue("18")]
 		public virtual Measure TabThickness {
 			get { return tabThickness; }
@@ -128,7 +146,7 @@ namespace Crow
 			gr.LineTo (Slot.Width-0.5, Slot.Height-0.5);
 			gr.LineTo (0.5, Slot.Height-0.5);
 			gr.ClosePath ();
-			gr.LineWidth = 2;
+			gr.LineWidth = 1;
 			Foreground.SetAsSource (gr);
 			gr.StrokePreserve ();
 
@@ -138,6 +156,8 @@ namespace Crow
 		}
 
 		#region Mouse Handling
+		public bool HoldCursor = false;
+
 		public override bool MouseIsIn (Point m)
 		{
 			if (!(Visible & IsEnabled) || IsDragged)
@@ -150,23 +170,22 @@ namespace Crow
 			return _contentContainer.ScreenCoordinates (_contentContainer.Slot).ContainsOrIsEqual (m)
 				|| mouseIsInTitle;
 		}
-		bool holdCursor = false;
 		public override void onMouseDown (object sender, MouseButtonEventArgs e)
 		{
 			base.onMouseDown (sender, e);
-			holdCursor = true;
+			HoldCursor = true;
 		}
 		public override void onMouseUp (object sender, MouseButtonEventArgs e)
 		{
 			base.onMouseUp (sender, e);
-			holdCursor = false;
+			HoldCursor = false;
 			(Parent as TabView).UpdateLayout (LayoutingType.ArrangeChildren);
 		}
 		public override void onMouseMove (object sender, MouseMoveEventArgs e)
 		{
 			base.onMouseMove (sender, e);
 
-			if (!(HasFocus&&holdCursor))
+			if (!(HasFocus && HoldCursor))
 				return;
 			TabView tv = Parent as TabView;
 			TabItem previous = null, next = null;
@@ -176,31 +195,28 @@ namespace Crow
 			else if (tmp > Parent.getSlot ().Width - TabTitle.Slot.Width - tv.Spacing)
 				TabOffset = Parent.getSlot ().Width - TabTitle.Slot.Width - tv.Spacing;
 			else{
-				int idx = tv.Children.IndexOf (this);
-				if (idx > 0 && e.XDelta < 0) {
-					previous = tv.Children [idx - 1] as TabItem;
-
+				TabItem[] tabItms = tv.Children.Cast<TabItem>().OrderBy (t=>t.ViewIndex).ToArray();
+				if (ViewIndex > 0 && e.XDelta < 0) {
+					previous = tabItms [ViewIndex - 1];
 					if (tmp < previous.TabOffset + previous.TabTitle.Slot.Width / 2) {
-						tv.Children.RemoveAt (idx);
-						tv.Children.Insert (idx - 1, this);
-						tv.SelectedTab = idx - 1;
+						previous.ViewIndex = ViewIndex;
+						ViewIndex--;
 						tv.UpdateLayout (LayoutingType.ArrangeChildren);
 					}
 
-				}else if (idx < tv.Children.Count - 1 && e.XDelta > 0) {
-					next = tv.Children [idx + 1] as TabItem;
+				}else if (ViewIndex < tabItms.Length - 1 && e.XDelta > 0) {
+					next = tabItms [ViewIndex + 1];
 					if (tmp > next.TabOffset - next.TabTitle.Slot.Width / 2){
-						tv.Children.RemoveAt (idx);
-						tv.Children.Insert (idx + 1, this);
-						tv.SelectedTab = idx + 1;
+						next.ViewIndex = ViewIndex;
+						ViewIndex++;
 						tv.UpdateLayout (LayoutingType.ArrangeChildren);
 					}
 				}
 				TabOffset = tmp;
 			}
 		}
-		public void butCloseTabClick (object sender, MouseButtonEventArgs e){
-			(Parent as TabView).RemoveChild(this);
+		public void butCloseTabClick (object sender, MouseButtonEventArgs e){			
+			QueryClose.Raise (this, null);
 		}
 		#endregion
 
diff --git a/src/GraphicObjects/TabView.cs b/src/GraphicObjects/TabView.cs
index 7bf93abd..3e776d3a 100644
--- a/src/GraphicObjects/TabView.cs
+++ b/src/GraphicObjects/TabView.cs
@@ -29,13 +29,14 @@ using System.Xml.Serialization;
 using System.ComponentModel;
 using Cairo;
 using System.Diagnostics;
+using System.Linq;
 
 namespace Crow
 {	
 	public class TabView : Group
 	{
 		#region CTOR
-		protected TabView() : base(){}
+		public TabView() : base(){}
 		public TabView (Interface iface) : base(iface){}
 		#endregion
 
@@ -46,7 +47,6 @@ namespace Crow
 		int selectedTab = 0;
 		#endregion
 
-
 		#region public properties
 		[XmlAttributeAttribute()][DefaultValue(Orientation.Horizontal)]
 		public virtual Orientation Orientation
@@ -92,6 +92,12 @@ namespace Crow
 		}
 		#endregion
 
+		void Ti_TabTitle_LayoutChanged (object sender, LayoutingEventArgs e)
+		{
+			if (e.LayoutType == LayoutingType.Width)
+				this.RegisterForLayouting (LayoutingType.ArrangeChildren);
+		}
+
 		public override void AddChild (GraphicObject child)
 		{
 			TabItem ti = child as TabItem;
@@ -99,22 +105,28 @@ namespace Crow
 				throw new Exception ("TabView control accept only TabItem as child.");
 
 			ti.MouseDown += Ti_MouseDown;
-
-			if (Children.Count == 0) {
-				ti.IsSelected = true;
-				SelectedTab = 0;
-			}
+			ti.TabTitle.LayoutChanged += Ti_TabTitle_LayoutChanged;
 
 			base.AddChild (child);
+
+			SelectedTab = ti.ViewIndex = Children.Count - 1;
 		}
+
 		public override void RemoveChild (GraphicObject child)
 		{
-			base.RemoveChild (child);
-			if (selectedTab > Children.Count - 1)
+			TabItem ti = child as TabItem;
+			if (ti == null)
+				throw new Exception ("TabView control accept only TabItem as child.");
+
+			ti.MouseDown -= Ti_MouseDown;
+			ti.TabTitle.LayoutChanged -= Ti_TabTitle_LayoutChanged;
+
+			if (selectedTab > Children.Count - 2)
 				SelectedTab--;
-			else
-				SelectedTab = selectedTab;
+			
+			base.RemoveChild (child);
 		}
+
 		public override bool ArrangeChildren { get { return true; } }
 		public override bool UpdateLayout (LayoutingType layoutType)
 		{
@@ -122,19 +134,20 @@ namespace Crow
 
 			if (layoutType == LayoutingType.ArrangeChildren) {
 				int curOffset = Spacing;
-				for (int i = 0; i < Children.Count; i++) {
-					if (!Children [i].Visible)
+				TabItem[] tabItms = Children.Cast<TabItem>().OrderBy (t=>t.ViewIndex).ToArray();
+				for (int i = 0; i < tabItms.Length; i++) {
+					if (!tabItms [i].Visible)
 						continue;
-					TabItem ti = Children [i] as TabItem;
-					ti.TabOffset = curOffset;
+					if (!tabItms [i].HoldCursor)
+						tabItms [i].TabOffset = curOffset;
 					if (Orientation == Orientation.Horizontal) {
-						if (ti.TabTitle.RegisteredLayoutings.HasFlag (LayoutingType.Width))
+						if (tabItms [i].TabTitle.RegisteredLayoutings.HasFlag (LayoutingType.Width))
 							return false;
-						curOffset += ti.TabTitle.Slot.Width + Spacing;
+						curOffset += tabItms [i].TabTitle.Slot.Width + Spacing;
 					} else {
-						if (ti.TabTitle.RegisteredLayoutings.HasFlag (LayoutingType.Height))
+						if (tabItms [i].TabTitle.RegisteredLayoutings.HasFlag (LayoutingType.Height))
 							return false;
-						curOffset += ti.TabTitle.Slot.Height + Spacing;
+						curOffset += tabItms [i].TabTitle.Slot.Height + Spacing;
 					}
 				}
 
@@ -163,15 +176,17 @@ namespace Crow
 				gr.Clip ();
 			}
 
-			for (int i = 0; i < Children.Count; i++) {
-				if (i == SelectedTab)
-					continue;
-				Children [i].Paint (ref gr);
-			}
-
-			if (SelectedTab < Children.Count && SelectedTab >= 0)
-				Children [SelectedTab].Paint (ref gr);
+			lock (Children) {
+				TabItem[] tabItms = Children.Cast<TabItem> ().OrderBy (t => t.ViewIndex).ToArray ();
+				for (int i = 0; i < tabItms.Length; i++) {
+					if (tabItms [i] == Children [SelectedTab])
+						continue;
+					tabItms [i].Paint (ref gr);
+				}
 
+				if (SelectedTab < tabItms.Length && SelectedTab >= 0)
+					Children [SelectedTab].Paint (ref gr);
+			}
 			gr.Restore ();
 		}
 
@@ -191,11 +206,11 @@ namespace Crow
 				Children[SelectedTab].checkHoverWidget (e);
 				return;
 			}
-			for (int i = Children.Count - 1; i >= 0; i--) {
-				TabItem ti = Children [i] as TabItem;
-				if (ti.TabTitle.MouseIsIn(e.Position))
+			TabItem[] tabItms = Children.Cast<TabItem>().OrderBy (t=>t.ViewIndex).ToArray();
+			for (int i = tabItms.Length - 1; i >= 0; i--) {				
+				if (tabItms [i].TabTitle.MouseIsIn(e.Position))
 				{
-					Children[i].checkHoverWidget (e);
+					tabItms [i].checkHoverWidget (e);
 					return;
 				}
 			}
diff --git a/src/GraphicObjects/TemplatedGroup.cs b/src/GraphicObjects/TemplatedGroup.cs
index 34d57727..069303dd 100644
--- a/src/GraphicObjects/TemplatedGroup.cs
+++ b/src/GraphicObjects/TemplatedGroup.cs
@@ -172,8 +172,20 @@ namespace Crow
 
 				cancelLoadingThread ();
 
+				if (data is IObservableList) {
+					IObservableList ol = data as IObservableList;
+					ol.ListAdd -= Ol_ListAdd;
+					ol.ListRemove -= Ol_ListRemove;
+				}
+
 				data = value;
 
+				if (data is IObservableList) {
+					IObservableList ol = data as IObservableList;
+					ol.ListAdd += Ol_ListAdd;
+					ol.ListRemove += Ol_ListRemove;
+				}
+
 				NotifyValueChanged ("Data", data);
 
 				lock (CurrentInterface.LayoutMutex)
@@ -193,6 +205,27 @@ namespace Crow
 			}
 		}
 
+		void Ol_ListRemove (object sender, ListChangedEventArg e)
+		{
+			if (this.isPaged) {
+				int p = e.Index / itemPerPage;
+				int i = e.Index % itemPerPage;
+				(items.Children [p] as Group).RemoveChild (i);
+			} else
+				items.RemoveChild (e.Index);
+		}
+
+		void Ol_ListAdd (object sender, ListChangedEventArg e)
+		{
+			if (this.isPaged) {
+				throw new NotImplementedException();
+//				int p = e.Index / itemPerPage;
+//				int i = e.Index % itemPerPage;
+//				(items.Children [p] as Group).InsertChild (i, e.Element);
+			} else
+				loadItem (e.Index, items);
+		}
+
 		[XmlAttributeAttribute][DefaultValue("SteelBlue")]
 		public virtual Color SelectionBackground {
 			get { return selBackground; }
@@ -311,7 +344,7 @@ namespace Crow
 			#endif
 
 			Group page;
-			if (typeof(Wrapper).IsAssignableFrom (items.GetType ())) {
+			if (typeof(TabView).IsAssignableFrom (items.GetType ())||typeof(Wrapper).IsAssignableFrom (items.GetType ())) {
 				page = items;
 				itemPerPage = int.MaxValue;
 			} else if (typeof(GenericStack).IsAssignableFrom (items.GetType ())) {
@@ -326,6 +359,8 @@ namespace Crow
 				isPaged = true;
 			} else {
 				page = Activator.CreateInstance (items.GetType ()) as Group;
+				page.CurrentInterface = items.CurrentInterface;
+				page.Initialize ();
 				page.Name = "page" + pageNum;
 				isPaged = true;
 			}
diff --git a/src/IListChanged.cs b/src/IListChanged.cs
new file mode 100644
index 00000000..b2b23375
--- /dev/null
+++ b/src/IListChanged.cs
@@ -0,0 +1,43 @@
+//
+// IListChanged.cs
+//
+// Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// Copyright (c) 2013-2017 Jean-Philippe Bruyère
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Crow
+{
+	public class ListChangedEventArg : EventArgs {
+		public int Index;
+		public object Element;
+		public ListChangedEventArg (int index, object element) {
+			Index = index;
+			Element = element;
+		}
+	}
+	public interface IObservableList {
+		event EventHandler<ListChangedEventArg> ListAdd;
+		event EventHandler<ListChangedEventArg> ListRemove;		
+	}
+}
+
diff --git a/src/Instantiator.cs b/src/Instantiator.cs
index b3f070e7..f5355c17 100644
--- a/src/Instantiator.cs
+++ b/src/Instantiator.cs
@@ -560,8 +560,13 @@ namespace Crow.IML
 				System.Reflection.Emit.Label finish = il.DefineLabel ();
 				il.Emit (OpCodes.Br, finish);
 				il.MarkLabel (cancel);
-				il.EmitWriteLine (string.Format ("Handler method '{0}' for '{1}' not found in new dataSource", bindingDef.TargetMember, sourceEvent.Name));
+				#if DEBUG_BINDING
+				il.EmitWriteLine (string.Format ("Handler method '{0}' for '{1}' NOT FOUND in new dataSource", bindingDef.TargetMember, sourceEvent.Name));
+				#endif
 				il.MarkLabel (finish);
+				#if DEBUG_BINDING
+				il.EmitWriteLine (string.Format ("Handler method '{0}' for '{1}' FOUND in new dataSource", bindingDef.TargetMember, sourceEvent.Name));
+				#endif
 				il.Emit (OpCodes.Ret);
 
 				//store dschange delegate in instatiator instance for access while instancing graphic object
@@ -1075,18 +1080,23 @@ namespace Crow.IML
 
 		/// <summary>
 		/// search for graphic object type in crow assembly, if not found,
-		/// search for type independently of namespace in entry assembly
+		/// search for type independently of namespace in all the loaded assemblies
 		/// </summary>
+		/// <remarks>
+		/// </remarks>
 		/// <returns>the corresponding type object</returns>
 		/// <param name="typeName">graphic object type name without its namespace</param>
 		Type tryGetGOType (string typeName){
 			Type t = Type.GetType ("Crow." + typeName);
 			if (t != null)
-				return t;
-			Assembly a = Assembly.GetEntryAssembly ();
-			foreach (Type expT in a.GetExportedTypes ()) {
-				if (expT.Name == typeName)
-					return expT;
+				return t;			
+			foreach (Assembly a in AppDomain.CurrentDomain.GetAssemblies()) {
+				if (a.IsDynamic)
+					continue;
+				foreach (Type expT in a.GetExportedTypes ()) {
+					if (expT.Name == typeName)
+						return expT;
+				}
 			}
 			return null;
 		}
diff --git a/src/Interface.cs b/src/Interface.cs
index 992ff6f6..d4cc63c4 100644
--- a/src/Interface.cs
+++ b/src/Interface.cs
@@ -132,7 +132,7 @@ namespace Crow
 		/// Each control need a ref to the root interface containing it, if not set in GraphicObject.currentInterface,
 		/// the ref of this one will be stored in GraphicObject.currentInterface
 		/// </summary>
-		internal static Interface CurrentInterface;
+		protected static Interface CurrentInterface;
 		internal Stopwatch clickTimer = new Stopwatch();
 		internal GraphicObject eligibleForDoubleClick = null;
 		#endregion
@@ -337,11 +337,11 @@ namespace Crow
 		/// <param name="path">path of the iml file to load</param>
 		public GraphicObject Load (string path)
 		{
-			try {
+			//try {
 				return GetInstantiator (path).CreateInstance (this);
-			} catch (Exception ex) {
-				throw new Exception ("Error loading <" + path + ">:", ex);
-			}
+			//} catch (Exception ex) {
+			//	throw new Exception ("Error loading <" + path + ">:", ex);
+			//}
 		}
 		/// <summary>
 		/// Fetch instantiator from cache or create it.
@@ -409,7 +409,7 @@ namespace Crow
 			}
 		}
 		/// <summary>Pointer is over the widget</summary>
-		public GraphicObject HoverWidget
+		public virtual GraphicObject HoverWidget
 		{
 			get { return _hoverWidget; }
 			set {
@@ -775,7 +775,7 @@ namespace Crow
 		/// <summary>Processes mouse move events from the root container, this function
 		/// should be called by the host on mouse move event to forward events to crow interfaces</summary>
 		/// <returns>true if mouse is in the interface</returns>
-		public bool ProcessMouseMove(int x, int y)
+		public virtual bool ProcessMouseMove(int x, int y)
 		{
 			int deltaX = x - Mouse.X;
 			int deltaY = y - Mouse.Y;
diff --git a/src/ObservableList.cs b/src/ObservableList.cs
new file mode 100644
index 00000000..c3d49e23
--- /dev/null
+++ b/src/ObservableList.cs
@@ -0,0 +1,46 @@
+//
+// IListChanged.cs
+//
+// Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// Copyright (c) 2013-2017 Jean-Philippe Bruyère
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using System.Collections.Generic;
+
+namespace Crow
+{	
+	public class ObservableList<T> : List<T> , IObservableList {
+		public event EventHandler<ListChangedEventArg> ListAdd;
+		public event EventHandler<ListChangedEventArg> ListRemove;		
+
+		public void AddElement (T elem) {
+			this.Add(elem);
+			ListAdd.Raise (this, new ListChangedEventArg (this.Count - 1, elem));
+		}
+		public void RemoveElement (T elem) {
+			int idx = this.IndexOf (elem);
+			this.RemoveAt (idx);
+			ListRemove.Raise (this, new ListChangedEventArg (idx, elem));
+		}
+	}
+}
+
-- 
2.47.3