Last fix was not correct -> We don't know the Type of the Insert Object

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

@@ -21,6 +21,7 @@ using System.Diagnostics;
 using System.Collections;
 using System.ComponentModel;
 using System.Globalization;
+using System.Linq;
 using System.Reflection;
 using System.Windows;
 using System.Windows.Documents;
@@ -107,10 +108,9 @@ namespace ICSharpCode.WpfDesign.XamlDom
 		/// </summary>
 		public static bool Insert(Type collectionType, object collectionInstance, XamlPropertyValue newElement, int index)
 		{
-			var mth = collectionType.GetMethod("Insert", BindingFlags.Public | BindingFlags.Instance,
+			var hasInsert = collectionType.GetMethods().Any(x => x.Name == "Insert");
-			                         null, CallingConventions.Any, new Type[]{ typeof(int), typeof(object) }, null);
 			
-			if (mth != null) {
+			if (hasInsert) {
 				collectionType.InvokeMember(
 					"Insert", BindingFlags.Public | BindingFlags.InvokeMethod | BindingFlags.Instance,
 					null, collectionInstance,