//Constructor:
 public Registration_window(BusinessLayer.ChatRoom c)
 {
     this.c                 = c;
     this.DataContext       = _main;
     this.ValidPasswordFlag = false;
     InitializeComponent();
 }
        //Constructor:
        public LoggedinWindow(BusinessLayer.ChatRoom c)
        {
            InitializeComponent();
            this.DataContext = _main;
            this.c           = c;
            display();
            dispatcherTimer       = new DispatcherTimer();
            dispatcherTimer.Tick += new EventHandler(showMessages);

            dispatcherTimer.Interval = new TimeSpan(0, 0, 2);

            intialSortFilterProps();

            dispatcherTimer.Start();
            this.Loaded += LoggedinWindow_Loaded;
        }