public virtual void RegisterListener(IServiceableListener listener)
 {
     if (!_listeners.Contains(listener))
     {
         _listeners.Add(listener);
     }
 }
 public virtual void RemoveListener(IServiceableListener listener)
 {
     if (_listeners.Contains(listener))
     {
         _listeners.Remove(listener);
     }
 }
            public override void RegisterListener(IServiceableListener listener)
            {
                base.RegisterListener(listener);

                var fc = listener as IServiceManagerListener;

                if (fc != null)
                {
                    _listeners.Add(fc);
                }
            }
 public void RemoveListener(IServiceableListener listener)
 {
     listenMgr.RemoveListener(listener);
 }