private void Author_Click(object sender, RoutedEventArgs e)
{
var context = new BookCardsViewModel(Model.Content.ByAuthor,
((Hyperlink)sender).NavigateUri.ToString());
DataContext = context;
}
public BookCards(Content content = Model.Content.All)
{
InitializeComponent();
var context = new BookCardsViewModel(content);
DataContext = context;
}