Model/ZoneManager.php
public function afterBlockModify(Event $event)
    {
        $block = $event->getBlock();
        $em = $this->getDoctrine()->getManager();
        foreach($em->getRepository('KitpagesCmsBundle:Zone')->findByBlock($block) as $zone) {
            $this->unpublish($zone);
        }
    }
public function afterBlockModify(Event $event)
    {
        $block = $event->getBlock();
        $em = $this->getDoctrine()->getManager();
        foreach($em->getRepository('KitpagesCmsBundle:Zone')->findByBlock($block) as $zone) {
            $this->unpublish($zone);
        }
    }
//