class Window : Gtk.Window
{
  construct
  {
    this.set_default_size (300, 200);
    this.destroy.connect (Gtk.main_quit);
    this.add (new Gtk.Label ("Hello World!"));
  }
}

void main (string[] args)
{
  Gtk.init (ref args);
  new Window ().show_all ();
  Gtk.main ();
}

