protected override void OnSelectionChangedCommand()
 {
     DownloadSelectedCommand.RaiseCanExecuteChanged();
     PlaySelectedCommand.RaiseCanExecuteChanged();
     AddSelectedToMyAudiosCommand.RaiseCanExecuteChanged();
     DeleteSelectedCommand.RaiseCanExecuteChanged();
 }
 private void OnSelectionChangedCommand()
 {
     DownloadSelectedCommand.RaiseCanExecuteChanged();
     PlaySelectedCommand.RaiseCanExecuteChanged();
     AddSelectedToMyCollectionCommand.RaiseCanExecuteChanged();
     DeleteSelectedCommand.RaiseCanExecuteChanged();
 }