$this->notebook->connect('key_press_event', array($this, nextTab));

function nextTab($widget, $event)
{
	if ($event->state == Gdk::CONTROL_MASK && $event->keyval == Gdk::KEY_Tab) {
		if ($widget->get_current_page() == $widget->get_n_pages()-1) {
			$widget->set_current_page(0);
		} else {
			$widget->next_page();
		}
	}
}

function nextTab($notebook,$event)
{
	if ($event->state == Gdk::CONTROL_MASK && $event->keyval == Gdk::KEY_Tab) {
		if ($notebook->get_current_page() == $notebook->get_n_pages()-1) {
			$notebook->set_current_page(0);
		} else {
			$notebook->next_page();
		}
		$this->set_focus_child($notebook);
	}
	
}