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diff --git a/Samples/CrowIDE/src/ProjectTree/ProjectNodes.cs b/Samples/CrowIDE/src/ProjectTree/ProjectNodes.cs
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+++ b/Samples/CrowIDE/src/ProjectTree/ProjectNodes.cs
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+//
+// ProjectNodes.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;
+using System.Linq;
+using System.Xml;
+using System.IO;
+using Crow;
+using System.Threading;
+
+namespace Crow.Coding
+{
+	public enum ItemType {
+		ReferenceGroup,
+		Reference,
+		ProjectReference,
+		VirtualGroup,
+		Folder,
+		None,
+		Compile,
+		EmbeddedResource,
+	}
+	public enum CopyToOutputState {
+		Never,
+		Always,
+		PreserveNewest
+	}
+	public class ProjectNode  : IValueChange
+	{
+		#region IValueChange implementation
+		public event EventHandler<ValueChangeEventArgs> ValueChanged;
+		public virtual void NotifyValueChanged(string MemberName, object _value)
+		{
+			ValueChanged.Raise(this, new ValueChangeEventArgs(MemberName, _value));
+		}
+		#endregion
+
+		#region CTOR
+		public ProjectNode (Project project, ItemType _type, string _name) : this(project){			
+			type = _type;
+			name = _name;
+			initCommands ();
+		}
+		public ProjectNode (Project project){
+			Project = project;
+			initCommands ();
+		}
+		public ProjectNode (){
+			initCommands ();
+		}
+		#endregion
+
+		void initCommands () {
+			Commands = new List<Crow.Command> ();
+		}
+
+		ProjectNode parent;
+		bool isExpanded;
+		protected bool isSelected;
+		ItemType type;
+		string name;
+		List<ProjectNode> childNodes = new List<ProjectNode>();
+
+		public Project Project;
+		public List<Crow.Command> Commands;//list of command available for that node
+
+		public virtual Crow.Picture Icon {
+			get {
+				switch (Type) {
+				case ItemType.Reference:
+					return new SvgPicture ("#Crow.Icons.assembly.svg");
+				case ItemType.ProjectReference:
+					return new SvgPicture("#Crow.Icons.projectRef.svg"); 
+				default:
+					return new SvgPicture("#CrowIDE.icons.blank-file.svg"); 
+				}
+			}
+		}
+		public ProjectNode Parent {
+			get { return parent; }
+			set { parent = value; }
+		}
+		public virtual ItemType Type {
+			get { return type; }
+		}
+		public virtual string DisplayName {
+			get { return name; }
+		}
+		public List<ProjectNode> ChildNodes {
+			get { return childNodes;	}
+		}
+		public void AddChild (ProjectNode pn) {
+			childNodes.Add(pn);
+			pn.Parent = this;
+		}
+		public void RemoveChild (ProjectNode pn){
+			pn.Parent = null;
+			childNodes.Remove (pn);
+		}
+		public void SortChilds () {
+			foreach (ProjectNode pn in childNodes)
+				pn.SortChilds ();			
+			childNodes = childNodes.OrderBy(c=>c.Type).ThenBy(cn=>cn.DisplayName).ToList();
+		}
+
+		public bool IsExpanded
+		{
+			get { return isExpanded; }
+			set
+			{
+				if (value == isExpanded)
+					return;
+				isExpanded = value;
+				NotifyValueChanged ("IsExpanded", isExpanded);
+			}
+		}
+		public virtual bool IsSelected
+		{
+			get { return isSelected; }
+			set
+			{
+				if (value == isSelected)
+					return;
+				
+				isSelected = value;
+
+				NotifyValueChanged ("IsSelected", isSelected);
+			}
+		}
+		public override string ToString ()
+		{
+			return DisplayName;
+		}
+	}
+}
+