public class MyWindow : Gtk.ApplicationWindow {

	internal MyWindow (MyApplication app) {

		Object (application: app, title: "Welcome to GNOME");

		var image = new Gtk.Image ();

		image.set_from_file ("gnome-image.png");

		this.add (image);

		this.set_default_size (300, 300);

	}

}

public class MyApplication : Gtk.Application {

	protected override void activate () {

		new MyWindow (this).show_all ();

	}

	internal MyApplication () {

		Object (application_id: "org.example.MyApplication");

	}

}

public int main (string[] args) {

	return new MyApplication ().run (args);

}