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diff --git a/src/GraphicObjects/Base/GenericStack.cs b/src/GraphicObjects/Base/GenericStack.cs
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+//
+// GenericStack.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.ComponentModel;
+using System.Diagnostics;
+using System.Xml.Serialization;
+using System;
+
+namespace Crow
+{
+	public class GenericStack : Group
+    {
+		#region CTOR
+		public GenericStack()
+			: base()
+		{            
+		}
+		#endregion
+
+		#region Private fields
+        int _spacing;
+        Orientation _orientation;
+		#endregion
+
+		#region Public Properties
+        [XmlAttributeAttribute()][DefaultValue(2)]
+        public int Spacing
+        {
+			get { return _spacing; }
+            set { 
+				if (_spacing == value)
+					return;
+				_spacing = value; 
+				NotifyValueChanged ("Spacing", Spacing);
+				RegisterForLayouting (LayoutingType.Sizing|LayoutingType.ArrangeChildren);
+			}
+        }
+        [XmlAttributeAttribute()][DefaultValue(Orientation.Horizontal)]
+        public virtual Orientation Orientation
+        {
+            get { return _orientation; }
+            set { _orientation = value; }
+        }
+		#endregion
+
+		#region GraphicObject Overrides
+		public override bool ArrangeChildren { get { return true; } }
+		public override void ChildrenLayoutingConstraints (ref LayoutingType layoutType)
+		{
+			//Prevent child repositionning in the direction of stacking
+			if (Orientation == Orientation.Horizontal)
+				layoutType &= (~LayoutingType.X);
+			else
+				layoutType &= (~LayoutingType.Y);			
+		}
+		protected override int measureRawSize (LayoutingType lt)
+		{
+			int totSpace = 0;
+			for (int i = 0; i < Children.Count; i++) {
+				if (Children [i].Visible)
+					totSpace += Spacing;
+			}
+			if (totSpace > 0)
+				totSpace -= Spacing;
+			if (lt == LayoutingType.Width) {
+				if (Orientation == Orientation.Horizontal)
+					return contentSize.Width + totSpace + 2 * Margin;
+			}else if (Orientation == Orientation.Vertical)
+				return contentSize.Height + totSpace + 2 * Margin;							
+			
+			return base.measureRawSize (lt);
+		}
+		public virtual void ComputeChildrenPositions()
+		{
+			int d = 0;
+			if (Orientation == Orientation.Horizontal) {
+				foreach (GraphicObject c in Children) {
+					if (!c.Visible)
+						continue;
+					c.Slot.X = d;
+					d += c.Slot.Width + Spacing;
+				}
+			} else {
+				foreach (GraphicObject c in Children) {
+					if (!c.Visible)
+						continue;					
+					c.Slot.Y = d;
+					d += c.Slot.Height + Spacing;
+				}
+			}
+			IsDirty = true;
+		}
+		GraphicObject stretchedGO = null;
+		public override bool UpdateLayout (LayoutingType layoutType)
+        {
+			RegisteredLayoutings &= (~layoutType);
+
+			if (layoutType == LayoutingType.ArrangeChildren) {
+				//allow 1 child to have size to 0 if stack has fixed or streched size policy,
+				//this child will occupy remaining space
+				//if stack size policy is Fit, no child may have stretch enabled
+				//in the direction of stacking.
+				ComputeChildrenPositions ();
+
+				//if no layouting remains in queue for item, registre for redraw
+				if (RegisteredLayoutings == LayoutingType.None && IsDirty)
+					CurrentInterface.EnqueueForRepaint (this);
+
+				return true;
+			}
+
+			return base.UpdateLayout(layoutType);
+        }
+
+		public override void OnChildLayoutChanges (object sender, LayoutingEventArgs arg)
+		{
+			GraphicObject go = sender as GraphicObject;
+			//Debug.WriteLine ("child layout change: " + go.LastSlots.ToString() + " => " + go.Slot.ToString());
+			switch (arg.LayoutType) {
+			case LayoutingType.Width:
+				if (Orientation == Orientation.Horizontal) {
+					if (go.Width == Measure.Stretched) {
+						if (stretchedGO == null && Width != Measure.Fit)
+							stretchedGO = go;
+						else if (stretchedGO != go) {
+							go.Slot.Width = 0;
+							go.Width = Measure.Fit;
+							return;
+						}
+					} else
+						contentSize.Width += go.Slot.Width - go.LastSlots.Width;
+
+					if (stretchedGO != null) {
+						int newW = Math.Max (
+							           this.ClientRectangle.Width - contentSize.Width - Spacing * (Children.Count - 1),
+							           stretchedGO.MinimumSize.Width);
+						if (stretchedGO.MaximumSize.Width > 0)
+							newW = Math.Min (newW, stretchedGO.MaximumSize.Width);
+						if (newW != stretchedGO.Slot.Width) {							
+							stretchedGO.Slot.Width = newW;
+							stretchedGO.IsDirty = true;
+#if DEBUG_LAYOUTING
+					Debug.WriteLine ("\tAdjusting Width of " + stretchedGO.ToString());
+#endif
+							stretchedGO.LayoutChanged -= OnChildLayoutChanges;
+							stretchedGO.OnLayoutChanges (LayoutingType.Width);
+							stretchedGO.LayoutChanged += OnChildLayoutChanges;
+							stretchedGO.LastSlots.Width = stretchedGO.Slot.Width;
+						}
+					}
+					
+					if (Width == Measure.Fit)
+						this.RegisterForLayouting (LayoutingType.Width);
+					
+					this.RegisterForLayouting (LayoutingType.ArrangeChildren);
+					return;
+				}
+				break;
+			case LayoutingType.Height:
+				if (Orientation == Orientation.Vertical) {
+					if (go.Height == Measure.Stretched) {
+						if (stretchedGO == null && Height != Measure.Fit)
+							stretchedGO = go;
+						else if (stretchedGO != go){
+							go.Slot.Height = 0;
+							go.Height = Measure.Fit;
+							return;
+						}
+					} else
+						contentSize.Height += go.Slot.Height - go.LastSlots.Height;
+					
+					if (stretchedGO != null) {
+						int newH = Math.Max (
+							this.ClientRectangle.Height - contentSize.Height - Spacing * (Children.Count - 1),
+							stretchedGO.MinimumSize.Height);
+						if (stretchedGO.MaximumSize.Height > 0)
+							newH = Math.Min (newH, stretchedGO.MaximumSize.Height);
+						if (newH != stretchedGO.Slot.Height) {
+							stretchedGO.Slot.Height = newH;
+							stretchedGO.IsDirty = true;
+#if DEBUG_LAYOUTING
+					Debug.WriteLine ("\tAdjusting Height of " + stretchedGO.ToString());
+#endif
+							stretchedGO.LayoutChanged -= OnChildLayoutChanges;
+							stretchedGO.OnLayoutChanges (LayoutingType.Height);
+							stretchedGO.LayoutChanged += OnChildLayoutChanges;
+							stretchedGO.LastSlots.Height = stretchedGO.Slot.Height;
+						}
+					}
+
+					if (Height == Measure.Fit)
+						this.RegisterForLayouting (LayoutingType.Height);
+
+					this.RegisterForLayouting (LayoutingType.ArrangeChildren);
+					return;
+				}
+				break;
+			}
+			base.OnChildLayoutChanges (sender, arg);
+		}
+		#endregion
+
+    
+	}
+}