internal async System.Threading.Tasks.Task OnDownload()
 {
     if (!playlistViewController.parsed)
     {
         playlistViewController.Parse();
     }
     await playlistViewController.DownloadPlaylistAsync();
 }
 internal async Task OnDownload()
 {
     if (!playlistViewController.parsed)
     {
         playlistViewController.Parse();
     }
     await playlistViewController.DownloadPlaylistAsync();
 }