public DataTemplateSelectorGallery()
{
InitializeComponent();
_demoFilteredItemSource = new DemoFilteredItemSource(filter: ItemMatches);
CollectionView.ItemsSource = _demoFilteredItemSource.Items;
SearchBar.SearchCommand = new Command(() =>
{
_demoFilteredItemSource.FilterItems(SearchBar.Text);
CollectionView.EmptyView = SearchBar.Text;
});
}