private void player_MediaEnded(object sender, RoutedEventArgs e)
        {
            timer.Stop();
            slider.Value     = 0;
            play.Visibility  = System.Windows.Visibility.Visible;
            pause.Visibility = System.Windows.Visibility.Collapsed;

            Open_Controls.Begin();
        }
 private void ContentPanel_Tap(object sender, System.Windows.Input.GestureEventArgs e)
 {
     try
     {
         if (controls.Visibility == System.Windows.Visibility.Collapsed)
         {
             Open_Controls.Begin();
         }
         else
         {
             Close_Controls.Begin();
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }