public int main (string[] args) {
  Gtk.init (ref args);

  var btn = new Gtk.Button ();
  btn.set_can_focus (false);
  GLib.debug ("get_can_focus() = %s", btn.get_can_focus() ? "true" : "false");
  btn.can_focus = true;
  GLib.debug ("can_focus = %s", btn.can_focus ? "true" : "false");

  return 0;
}