public void RemoveCallBack(IExpiredCallBack callBack)
 {
     if (Debugger.IsAttached) Debug.WriteLine("RemovCallBack");
     _expiredCallBacks.Remove(callBack);
 }
 public void AddCallBack(IExpiredCallBack callBack)
 {
     if (Debugger.IsAttached) Debug.WriteLine("AddCallBack");
     _expiredCallBacks.Add(callBack);
 }