fixes Bug #408 -> XAML Window Resources doubled

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/XamlDom/SamplesTests.cs

@@ -147,6 +147,18 @@ namespace ICSharpCode.WpfDesign.Tests.XamlDom
             TestLoading(@"<UserControl
     xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
     xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"">
+    <UserControl.Resources>
+       <ResourceDictionary />
+   </UserControl.Resources>
+  </UserControl>");
+        }
+
+        [Test]
+		public void Resources3()
+		{
+			TestLoading(@"<UserControl
+    xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
+    xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"">
     <FrameworkElement.Resources>
        <ResourceDictionary />
    </FrameworkElement.Resources>

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

@@ -21,10 +21,8 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Linq;
-using System.Text;
 using System.Xml;
 using System.Windows;
-using System.Windows.Markup;
 
 namespace ICSharpCode.WpfDesign.XamlDom
 {
@@ -315,11 +313,38 @@ namespace ICSharpCode.WpfDesign.XamlDom
 			return this.IsAttached ? this.PropertyTargetType : parentObject.ElementType;
 		}
 		
-		static XmlNode FindChildNode(XmlNode node, string localName, string namespaceURI)
+		static XmlNode FindChildNode(XmlNode node, Type elementType, string propertyName, XamlDocument xamlDocument)
+		{
+		    var localName = elementType.Name + "." + propertyName;
+		    var namespaceURI = xamlDocument.GetNamespaceFor(elementType);
+
+            foreach (XmlNode childNode in node.ChildNodes)
 		    {
-			foreach (XmlNode childNode in node.ChildNodes) {
 		        if (childNode.LocalName == localName && childNode.NamespaceURI == namespaceURI)
+		        {
 		            return childNode;
+		        }
+		    }
+
+		    var type = elementType.BaseType;
+            namespaceURI = xamlDocument.GetNamespaceFor(type);
+
+            while (type != typeof(object))
+		    {
+		        if (type.GetProperty(propertyName) == null)
+		            break;
+
+                localName = type.Name + "." + propertyName;
+
+                foreach (XmlNode childNode in node.ChildNodes)
+		        {
+		            if (childNode.LocalName == localName && childNode.NamespaceURI == namespaceURI)
+		            {
+		                return childNode;
+		            }
+		        }
+
+                type = type.BaseType;
             }
 		    
 			return null;
@@ -335,7 +360,7 @@ namespace ICSharpCode.WpfDesign.XamlDom
 			if (this.IsCollection) {
 				if (IsNodeCollectionForThisProperty(newChildNode)) {
 					Type propertyElementType = GetPropertyElementType();
-					XmlNode parentNode = FindChildNode(parentObject.XmlElement, propertyElementType.Name + "." + this.PropertyName, parentObject.OwnerDocument.GetNamespaceFor(propertyElementType));
+					XmlNode parentNode = FindChildNode(parentObject.XmlElement, propertyElementType, this.PropertyName, parentObject.OwnerDocument);
 
 					if (parentNode == null) {
 						parentNode = CreatePropertyElement();