void player_NextClick(object sender, EventArgs e)
        {
            try { l.Remove((l.GetAdorners(nav))[0]); }
            catch { }


            StackPanel sp = new StackPanel();
            sp.Margin = new Thickness(0, server.ActualHeight + 5, 0, 0);
            sp.Width = nav.ActualWidth;

            var tb = CreateServerHelp();

            Polygon poly = CreateTriangle();

            sp.Children.Add(poly);
            sp.Children.Add(tb);

            UIElementAdorner d = new UIElementAdorner(sp, server);
            l = AdornerLayer.GetAdornerLayer(nav);
            l.Add(d);
        }
        private void TextBlock_MouseDown(object sender, MouseButtonEventArgs e)
        {
            DockPanel overlayContainer = new DockPanel();
            overlayContainer.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;
            overlayContainer.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
            overlayContainer.Background = new SolidColorBrush(Color.FromArgb(100, 0,0,0));            
            overlayContainer.Width = app.ActualWidth;
            overlayContainer.Height = app.ActualHeight;
            overlayContainer.LastChildFill = false;

            var player = new Player();
            player.Width = 300;
            player.Height = 50;
            player.SetValue(DockPanel.DockProperty, Dock.Bottom);
            player.NextClick += new EventHandler(player_NextClick);
            player.StopClick += new EventHandler(player_StopClick);
            overlayContainer.Children.Add(player);

            UIElementAdorner overlayAdorner = new UIElementAdorner(overlayContainer, app);
            overlayAdonerLayer = AdornerLayer.GetAdornerLayer(app);
            overlayAdonerLayer.Add(overlayAdorner);            


            StackPanel sp = new StackPanel();            
            sp.Margin = new Thickness(0, nav.ActualHeight + 5, 0, 0);
            sp.Width = nav.ActualWidth;

            var tb = CreateNavHelp();

            Polygon poly = CreateTriangle();

            sp.Children.Add(poly);
            sp.Children.Add(tb);


            UIElementAdorner d = new UIElementAdorner(sp, nav);
            l = AdornerLayer.GetAdornerLayer(nav);
            l.Add(d);

           
        }