Xaml Object

When using GetPrefixOfNamespace the XMLElement may not yet be in the XML Tree, but the Xaml Object has it ParentObject Property already set, so use this!

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

@@ -105,9 +105,26 @@ namespace ICSharpCode.WpfDesign.XamlDom
 			}
 		}
 
-		static XmlElement VirtualAttachTo(XmlElement e, XmlElement target) 
+		string GetPrefixOfNamespace(string ns, XmlElement target)
 		{
-			var prefix = target.GetPrefixOfNamespace(e.NamespaceURI);
+			var prefix = target.GetPrefixOfNamespace(ns);
+			if (!string.IsNullOrEmpty(prefix))
+				return prefix;
+			var obj = this;
+			while (obj != null)
+			{
+				prefix = obj.XmlElement.GetPrefixOfNamespace(ns);
+				if (!string.IsNullOrEmpty(prefix))
+					return prefix;
+				obj = obj.ParentObject;
+			}
+			return null;
+		}
+		
+		XmlElement VirtualAttachTo(XmlElement e, XmlElement target)
+		{
+			var prefix = GetPrefixOfNamespace(e.NamespaceURI, target);
+			
 			XmlElement newElement = e.OwnerDocument.CreateElement(prefix, e.LocalName, e.NamespaceURI);
 
 			foreach (XmlAttribute a in target.Attributes) {