private function buildMenu(ItemInterface $rootMenu, Page $page, array $options)
 {
     $titleGetter = 'get' . ucfirst($options['title_property']);
     $menu = $rootMenu->addChild($page->{$titleGetter}())->setAttribute('id', $page->getId());
     if ($options['root_as_child']) {
         $menu->addChild($page->{$titleGetter}())->setUri($page->getMainUrl())->setAttribute('id', $page->getId());
     }
     foreach ($page->getChildren() as $childPage) {
         $menu->addChild($childPage->{$titleGetter}())->setUri($childPage->getMainUrl())->setAttribute('id', $childPage->getId());
     }
 }