bugfix mc:Ignorable

WpfDesign.XamlDom/Project/XamlDocument.cs

@@ -340,7 +340,7 @@ namespace ICSharpCode.WpfDesign.XamlDom
 				
 				if (@namespace == XamlConstants.DesignTimeNamespace)
 				{
-					var ignorableProp = new XamlProperty(this._rootElement, new XamlDependencyPropertyInfo(MarkupCompatibilityProperties.IgnorableProperty, true, null));
+					var ignorableProp = new XamlProperty(this._rootElement, new XamlDependencyPropertyInfo(MarkupCompatibilityProperties.IgnorableProperty, true, "Ignorable"));
 					ignorableProp.SetAttribute(prefix);
 				}
 			}