Do not create an event when the default event doesn't exist on double clicking an element.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/wpfdesigner@6275 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.AddIn/Src/AbstractEventHandlerService.cs

@@ -88,8 +88,9 @@ namespace ICSharpCode.WpfDesign.AddIn
 			object[] attributes = item.ComponentType.GetCustomAttributes(typeof(DefaultEventAttribute), true);
 			if (attributes.Length == 1) {
 				DefaultEventAttribute dae = (DefaultEventAttribute)attributes[0];
-                // To filter controls derived from ItemsControl
+				var events = TypeDescriptor.GetEvents(item.Component);
-                if (dae.Name != "OnItemsChanged")
+               var eventInfo = events[dae.Name];
+               if(eventInfo != null)
                {
                    DesignItemProperty property = item.Properties.GetProperty(dae.Name);
                    if (property != null && property.IsEvent)