public void XmppConnectOnOnPresence(object sender, agsXMPP.protocol.client.Presence pres)
        {
            try
            {
                if (pres.GetAttribute("name") == "Facebook User")
                    return;
                switch (pres.Type)
                {
                    case PresenceType.available:
                        if (Core.Presences.Contains(pres))
                            Core.Presences.Remove(pres);
                        Core.Presences.Add(pres);

                        var itemOnline = Core.AllPlayers[pres.GetAttribute("name")];
                        Core.AllPlayers.Remove(pres.GetAttribute("name"));
                        itemOnline.IsOnline = true;
                        Core.AllPlayers.Add(pres.GetAttribute("name"), itemOnline);
                        break;
                    case PresenceType.unsubscribe:
                    case PresenceType.unsubscribed:
                    case PresenceType.invisible:
                        if (Core.Presences.Contains(pres))
                            Core.Presences.Remove(pres);

                        var itemOffline = Core.AllPlayers[pres.GetAttribute("name")];
                        Core.AllPlayers.Remove(pres.GetAttribute("name"));
                        itemOffline.IsOnline = false;
                        Core.AllPlayers.Add(pres.GetAttribute("name"), itemOffline);
                        break;
                }
                Load();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }