titlebar.js

const Gtk = imports.gi.Gtk;
const Lang = imports.lang;

Gtk.init(null, 0);

print("Gtk Version: " + Gtk.MAJOR_VERSION +"."+Gtk.MINOR_VERSION+"."+Gtk.MICRO_VERSION);

let test_window = new Gtk.Window({
    default_width: 800,
    default_height: 600
});

let frame = new Gtk.Frame();
let img = Gtk.Image.new_from_file("thumb.jpg");
let events = new Gtk.EventBox();
events.add(img);
frame.add(events);
test_window.set_titlebar(frame);

events.connect('button-press-event', function() {
    log("button-press-event");
});

events.connect('button-release-event', function() {
    log("button-release-event");
});

test_window.show_all();
Gtk.main();