public void UnRegisterOnPointerDown(GameObject gameObject, Action <GameObject, BaseEventData> action)
 {
     UGUIEventListener.RemoveListener(gameObject, action, "onPointerDown");
 }
 public void UnRegisterOnDrag(GameObject gameObject, Action <GameObject, BaseEventData> action)
 {
     UGUIEventListener.RemoveListener(gameObject, action, "onDrag");
 }