private void HandleSettings() { Settings.IsVisible = !Settings.IsVisible; if (Settings.IsVisible) { if (AudioTrack.ItemsSource == null) { BindStreamPicker(AudioTrack, StreamDescription.StreamType.Audio); } if (VideoQuality.ItemsSource == null) { BindStreamPicker(VideoQuality, StreamDescription.StreamType.Video); } if (Subtitles.ItemsSource == null) { BindSubtitleStreamPicker(); } PlayButton.IsEnabled = false; AudioTrack.Focus(); } }