private function addGroupedContentTypes(MenuEntry $groupEntry, array $contentTypes)
    {
        foreach ($contentTypes as $contentTypeKey => $contentType) {
            /** @var Bag $contentType */
            $groupEntry->add(
                MenuEntry::create($contentTypeKey)
                    ->setRoute('overview', ['contenttypeslug' => $contentTypeKey])
                    ->setLabel($contentType->get('name'))
                    ->setIcon($contentType->get('icon_many', 'fa:th-list'))
                    ->setPermission('contenttype:' . $contentTypeKey)
            );
        }
    }