internal new void Remove(MucRoomMember member)
 {
     if (Contains(member))
     {
         base.Remove(member);
         InvokeMemberRemoved(member);
         manager.UnregisterService(member.Jid);
     }
 }
 public void UnregisterXmppService(Jid jid)
 {
     serviceManager.UnregisterService(jid);
 }