public function onDisplayWorkspace(DisplayToolEvent $event)
    {
        $workspace = $event->getWorkspace();

        $content = $this->templating->render(
            'ClarolineCoreBundle:workspace:analytics.html.twig', [
                'workspace' => $workspace,
            ]
        );

        $event->setContent($content);
        $event->stopPropagation();
    }