public function onDisplayDesktop(DisplayToolEvent $event)
    {
        $content = $this->templating->render(
            'ClarolineCoreBundle:tool:resources.html.twig', [
                'context' => [
                    'type' => Widget::CONTEXT_DESKTOP,
                ],
                'root' => null,
            ]
        );

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