//public ICommand ClickCommand
//{
// get { return (ICommand)GetValue(ClickCommandProperty); }
// set { SetValue(ClickCommandProperty, value); }
////}
//public static readonly DependencyProperty ClickCommandProperty =
// DependencyProperty.Register("ClickCommand", typeof(ICommand), typeof(ThumbnailControl), new PropertyMetadata());
private void selection_Checked(object sender, RoutedEventArgs e)
{
OnSelected?.Execute(e);
}