static void Main()
{
// Create a program that will show two different windows,
// and will wait until both are closed before ending.
Program app = new Program();
app.ShutdownMode = ShutdownMode.OnLastWindowClose;
// First approach: window with XAML content.
Window1 window1 = new Window1("Window1.xaml");
window1.Show();
// Second approach: XAML for complete window.
Xaml2009Window window2 = Xaml2009Window.LoadWindowFromXaml("Xaml2009.xaml");
window2.Show();
app.Run();
}