protected override void OnLastListenerRemoved()
 {
     _inner.RemoveEventHandler(BindAction);
     base.OnLastListenerRemoved();
 }
 protected override void OnLastListenerRemoved()
 {
     _left.RemoveEventHandler(_BroadCastEvent);
     _right.RemoveEventHandler(_BroadCastEvent);
     base.OnLastListenerRemoved();
 }