private void imgbtnHelp_MouseDown(object sender, MouseButtonEventArgs e)
 {
     ucBox_help = new Box_helpUC();
     Global.Instance.WindowMain.grdBox_helpUC.Children.Add(ucBox_help);
 }
 public Box_helpUC()
 {
     box_HelpUC = this;
     InitializeComponent();
     ChangeVideoActivity();
 }