public ClientMainWindow()
        {
            InitializeComponent();
            var loginWindow = new ClientLoginWindow(this);
            if (loginWindow.ShowDialog() == true) {
                logged = true;
            } else {
                this.Close();
                return;
            }

            usersTimer = new DispatcherTimer();
            usersTimer.Tick += new EventHandler(usersTimer_Tick);
            usersTimer.Interval = new TimeSpan(0, 0, 1);
            usersTimer.Start();
        }
        public ClientMainWindow()
        {
            InitializeComponent();
            var loginWindow = new ClientLoginWindow(this);

            if (loginWindow.ShowDialog() == true)
            {
                logged = true;
            }
            else
            {
                this.Close();
                return;
            }

            usersTimer          = new DispatcherTimer();
            usersTimer.Tick    += new EventHandler(usersTimer_Tick);
            usersTimer.Interval = new TimeSpan(0, 0, 1);
            usersTimer.Start();
        }