Fixes in Template helper:

Remove Added Key and Namespaces...

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/CanvasPlacementSupport.cs

@@ -70,21 +70,21 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 			if (IsPropertySet(child, Canvas.LeftProperty) || !IsPropertySet(child, Canvas.RightProperty)) {
 				x = GetCanvasProperty(child, Canvas.LeftProperty);
 			} else {
-                x = extendedComponent.ActualWidth - GetCanvasProperty(child, Canvas.RightProperty) - PlacementOperation.GetRealElementSize(child).Width;
+				x = extendedComponent.ActualWidth - GetCanvasProperty(child, Canvas.RightProperty) - PlacementOperation.GetRealElementSize(child).Width;
 			}
 
 
 			if (IsPropertySet(child, Canvas.TopProperty) || !IsPropertySet(child, Canvas.BottomProperty)) {
 				y = GetCanvasProperty(child, Canvas.TopProperty);
 			} else {
-                y = extendedComponent.ActualHeight - GetCanvasProperty(child, Canvas.BottomProperty) - PlacementOperation.GetRealElementSize(child).Height;
+				y = extendedComponent.ActualHeight - GetCanvasProperty(child, Canvas.BottomProperty) - PlacementOperation.GetRealElementSize(child).Height;
 			}
 
 			var p = new Point(x, y);
-            //Fixes, Empty Image Resized to 0
+			//Fixes, Empty Image Resized to 0
-            //return new Rect(p, child.RenderSize);
+			//return new Rect(p, child.RenderSize);
-            return new Rect(p, PlacementOperation.GetRealElementSize(item.View));
+			return new Rect(p, PlacementOperation.GetRealElementSize(item.View));
-        }
+		}
 		
 		public override void SetPosition(PlacementInformation info)
 		{

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/DefaultPlacementBehavior.cs

@@ -81,9 +81,9 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 		{
 			InfoTextEnterArea.Stop(ref infoTextEnterArea);
 
-		    this.ExtendedItem.Services.Selection.SetSelectedComponents(null);
+			this.ExtendedItem.Services.Selection.SetSelectedComponents(null);
-		    this.ExtendedItem.Services.Selection.SetSelectedComponents(operation.PlacedItems.Select(x => x.Item).ToList());
+			this.ExtendedItem.Services.Selection.SetSelectedComponents(operation.PlacedItems.Select(x => x.Item).ToList());
-        }
+		}
 
 		public virtual Rect GetPosition(PlacementOperation operation, DesignItem item)
 		{
@@ -91,7 +91,7 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 				return Rect.Empty;
 			var p = item.View.TranslatePoint(new Point(), operation.CurrentContainer.View);
 			
-		    return new Rect(p, PlacementOperation.GetRealElementSize(item.View));
+			return new Rect(p, PlacementOperation.GetRealElementSize(item.View));
 		}
 
 		public virtual void BeforeSetPosition(PlacementOperation operation)
@@ -100,8 +100,8 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 
 		public virtual void SetPosition(PlacementInformation info)
 		{
-		    if (info.Operation.Type != PlacementType.Move)
+			if (info.Operation.Type != PlacementType.Move)
-		        ModelTools.Resize(info.Item, info.Bounds.Width, info.Bounds.Height);
+				ModelTools.Resize(info.Item, info.Bounds.Width, info.Bounds.Height);
 		}
 
 		public virtual bool CanLeaveContainer(PlacementOperation operation)
@@ -164,8 +164,8 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 				}
 			}
 
-		    if (ExtendedItem.ContentProperty.ReturnType == typeof(string))
+			if (ExtendedItem.ContentProperty.ReturnType == typeof(string))
-		        return false;
+				return false;
 
 			if (!ExtendedItem.ContentProperty.IsSet)
 				return true;

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.XamlDom/Project/TemplateHelper.cs

@@ -51,15 +51,21 @@ namespace ICSharpCode.WpfDesign.XamlDom
 					break;
 			}
 
-			foreach (var dictentry in ns)
+			foreach (var dictentry in ns.ToList())
 			{
-				xmlElement.SetAttribute("xmlns:" + dictentry.Key, dictentry.Value);
+				if (xmlElement.HasAttribute("xmlns:" + dictentry.Key))
+					ns.Remove(dictentry.Key);
+				else
+					xmlElement.SetAttribute("xmlns:" + dictentry.Key, dictentry.Value);
 			}
 
 			var keyAttrib = xmlElement.GetAttribute("Key", XamlConstants.XamlNamespace);
 
-			if (string.IsNullOrEmpty(keyAttrib))
+			bool keySet = false;
+			if (string.IsNullOrEmpty(keyAttrib)) {
+				keySet = true;
 				xmlElement.SetAttribute("Key", XamlConstants.XamlNamespace, "$$temp&&§§%%__");
+			}
 
 			var xaml = xmlElement.OuterXml;
 			xaml = "<ResourceDictionary xmlns=\"http://schemas.microsoft.com/netfx/2007/xaml/presentation\" xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\">" + xaml + "</ResourceDictionary>";
@@ -111,11 +117,20 @@ namespace ICSharpCode.WpfDesign.XamlDom
 
 			var result = (ResourceDictionary)writer.Result;
 
+			if (keySet)
+				xmlElement.RemoveAttribute("Key", XamlConstants.XamlNamespace);
+			
+			foreach (var dictentry in ns)
+			{
+				xmlElement.RemoveAttribute("xmlns:" + dictentry.Key);
+			}
+			
 			var enr = result.Keys.GetEnumerator();
 			enr.MoveNext();
 			var rdKey = enr.Current;
 
 			var template = result[rdKey] as FrameworkTemplate;
+			
 			result.Remove(rdKey);
 			return template;
 		}