private void menuChangeScreen_Click(object sender, RoutedEventArgs e)
        {
            ChangeScreen chgScrn = new ChangeScreen(this);

            chgScrn.Show();
        }
 private void menuChangeScreen_Click(object sender, RoutedEventArgs e)
 {
     ChangeScreen chgScrn = new ChangeScreen(this);
     chgScrn.Show();
 }