public function onConfigureMenu(ConfigureMenuEvent $event)
 {
     $event->getMenu()->addChild('Emails', array('route' => 'corrigeaton_mailer_admin_mail_index'))->setExtra('logo', 'envelope');
 }
 public function onConfigureMenu(ConfigureMenuEvent $event)
 {
     $event->getMenu()->addChild('Rapports', array('route' => 'report'))->setExtra('logo', 'bolt');
 }