public static void UnregisterCallback(CallbackEventHandler handler, long eventTypeId, Delegate callback, TrickleDown trickle)
        {
            var registry = CallbackEventHandlerRef.GetCallbackRegistry(handler);

            EventCallbackRegistryRef.UnregisterCallback(registry, eventTypeId, callback, trickle);
        }
 public void Unregister()
 {
     EventCallbackRegistryRef.UnregisterCallback(callbackRegistry, eventTypeId, callback, trickleDown);
 }