public override void Initialize()
{
_mediaPlayer = (MediaElement)VisualTreeHelper.GetChild((DependencyObject)Application.Current.MainWindow.Content, 0);
_mediaPlayer.UpdateLayout();
_mediaPlayer.MediaEnded += MediaPlayerOnMediaEnded;
_mediaPlayer.MediaFailed += MediaPlayerOnMediaFailed;
_mediaPlayer.MediaOpened += MediaPlayerOnMediaOpened;
}