Fix Cannot Add Test, because Button can now recieve Content! So use a Image instead!

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/Designer/EditOperationTests.cs

@@ -81,10 +81,23 @@ namespace ICSharpCode.WpfDesign.Tests.Designer
 			return grid;
 		}
 
+		private DesignItem IntializePasteOperationsCannotAddTest()
+		{
+			var grid = CreateGridContextWithDesignSurface("<Button Name=\"TestElement\"/><Grid><Image/></Grid><Window/><ListBox/>");
+			Assert.IsNotNull(grid);
+			var xamlConxtext = grid.Context as XamlDesignContext;
+			if (xamlConxtext != null) {
+				_name = grid.ContentProperty.CollectionElements[0].Name;
+				xamlConxtext.XamlEditAction.Cut(new[] {grid.ContentProperty.CollectionElements[0]});
+			} else
+				Assert.Fail();
+			return grid;
+		}
+		
 		[Test]
 		public void PasteWhenContentControlSelectedAndCannotAdd()
 		{
-			var grid = IntializePasteOperationsTest();
+			var grid = IntializePasteOperationsCannotAddTest();
 			var xamlContext = grid.Context as XamlDesignContext;
 			Assert.IsNotNull(xamlContext);