public function onDisplayTool(OpenAdministrationToolEvent $event)
    {
        $content = $this->templating->render(
            'ClarolineCoreBundle:administration:scheduled_tasks.html.twig', [
                'isCronConfigured' => $this->configHandler->hasParameter('is_cron_configured') && $this->configHandler->getParameter('is_cron_configured'),
            ]
        );

        $event->setResponse(new Response($content));
        $event->stopPropagation();
    }