private void vectorUsers(long chanId, Vector<String> users){
		ChannelTree ct = ctrl.getChannel(chanId);
		if(ct instanceof ChannelGroup){
			ChannelGroup cg = (ChannelGroup)ct;
			for(long id : cg.getChildren()){
				vectorUsers(id,users);
			}
		}
		else{
			Channel ch = (Channel)ct;
			Vector<String>chUsers = ch.getUsers();
			for(String username : chUsers){
				if(!users.contains(username)){
					users.add(username);
				}
			}
		}
	}