public function onDisplayTool(OpenAdministrationToolEvent $event)
    {
        $content = $this->templating->render(
            'ClarolineCoreBundle:administration:technical.html.twig', [
                'context' => [
                    'type' => Tool::ADMINISTRATION,
                ],
                'parameters' => $this->serializer->serialize(),
                'adminTools' => array_map(function (AdminTool $tool) {
                    return $tool->getName();
                }, $this->om->getRepository(AdminTool::class)->findAll()),
            ]
        );

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