private void CloseVolumeWindow()
 {
     _VolumeWindow.Close();
     _VolumeWindow     = null;
     VolumeIcon.Source = new BitmapImage(new Uri(@"/Images/音量.png", UriKind.RelativeOrAbsolute));
 }
 private void OpenVolumeWindow()
 {
     _VolumeWindow = new VolumeWindow(this);
     _VolumeWindow.Show();
     VolumeIcon.Source = new BitmapImage(new Uri(@"/Images/音量_高光.png", UriKind.RelativeOrAbsolute));
 }