private async void Button_Click(object sender, RoutedEventArgs e)
{
// Add to favorite
await ExClient.AddToFavorite(GalleryViewModel.Gallery.Gid, GalleryViewModel.Gallery.Token, FavoriteCatalogComboBox.SelectedIndex, FavoriteNoteTextBox.Text);
GalleryViewModel.IsFavorited = true;
FavoriteButton.Flyout.Hide();
}
