public IS3MainWindow()
        {
            InitializeComponent();

            Closing += MainWindow_Closing;

            UserPreferences userPrefs = new UserPreferences();

            this.Height      = userPrefs.WindowHeight;
            this.Width       = userPrefs.WindowWidth;
            this.Top         = userPrefs.WindowTop;
            this.Left        = userPrefs.WindowLeft;
            this.WindowState = userPrefs.WindowState;

            UserLoginPage userLoginPage = new UserLoginPage();

            pageTransitionControl.ShowPage(userLoginPage);
        }