virtual protected void OnNewList(ImListReceivedFromServerArgs e)
 {
     if (ListEventHandler != null)
     {
         ListEventHandler(this, e);
     }
 }
        private void _clientHandler_ListEventHandler(object sender, ImListReceivedFromServerArgs e)
        {
            Application.Current.Dispatcher.Invoke(new Action(() =>
            {
                foreach (IMLibrary.Client client in e.ClientList)
                {
                    if (GeneratedClientList.Count(cli => cli.UserName == client.UserName) == 0)
                    {
                        ChatDialogueLocal chatDialogoue = new ChatDialogueLocal {
                            lblUsername = { Content = client.UserName }, lblFingerPrint = { Content = client.FingerPrint }
                        };

                        chatDialogoue.ChangeColourOfPrint();
                        chatDialogoue.LoadPrint();

                        User user = new User(client.UserName, client.Available, client.FingerPrint, client.PublicKey, client.Buddies, 0);
                        _clientPromtList.Add(new Tuple <IMLibrary.Client, ChatDialogueLocal>(user, chatDialogoue));

                        GeneratedClientList.Add(user);
                    }
                    else
                    {
                        GeneratedClientList.First(cli => cli.UserName == client.UserName).Available   = client.Available;
                        GeneratedClientList.First(cli => cli.UserName == client.UserName).PublicKey   = client.PublicKey;
                        GeneratedClientList.First(cli => cli.UserName == client.UserName).FingerPrint = client.FingerPrint;
                        _clientPromtList.Single(cli => cli.Item1.UserName == client.UserName).Item2.lblFingerPrint.Content = client.FingerPrint;
                        _clientPromtList.Single(cli => cli.Item1.UserName == client.UserName).Item2.ChangeColourOfPrint();
                        _clientPromtList.Single(cli => cli.Item1.UserName == client.UserName).Item2.LoadPrint();
                    }
                }
            }));
        }