/// <summary>
        /// Handler for the system transport controls button.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void SystemMediaControls_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs e)
        {
            switch (e.Button)
            {
            case SystemMediaTransportControlsButton.Play:
                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                {
                    Scenario6MediaElement.Play();
                });

                break;

            case SystemMediaTransportControlsButton.Pause:
                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                {
                    Scenario6MediaElement.Pause();
                });

                break;

            case SystemMediaTransportControlsButton.Stop:
                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                {
                    Scenario6MediaElement.Stop();
                });

                break;

            default:
                break;
            }
        }