public static int main (string[] args) {

    //---------------------
        // COMPILE WITH: valac --pkg clutter-gtk-1.0 --pkg gtk+-3.0 test.vala
        //---------------------
        // Problem: The whole window should be red!
        //-------

        GtkClutter.init (ref args);
        Gtk.Settings.get_default().gtk_application_prefer_dark_theme = true;

    Gtk.Window window;
    GtkClutter.Embed embed;
    Clutter.Stage stage;
    Gdk.RGBA color = {1.0, 0.0, 0.0, 1.0}; /* 100% opaque red */
        Gdk.RGBA transparent = {0.0, 1.0, 0.0, 0.5}; /* 100% transparent green */
        Clutter.Color c_color = {255, 255, 255, 0}; /* 100% transparent white*/

        window = new Gtk.Window();
        embed = new GtkClutter.Embed();
        embed.margin_top = 50;
        window.add(embed);
        window.set_default_size (250, 250);

        stage = embed.get_stage () as Clutter.Stage;
        stage.use_alpha = true;
        stage.background_color = c_color;

        window.override_background_color(Gtk.StateFlags.NORMAL, color);
        embed.override_background_color(Gtk.StateFlags.NORMAL, transparent);
        window.show_all();

    Gtk.main ();
    return 0;
}