/**
  * Fills given parentPage's childPages attribute recursively with pages
  *
  * @param \PwTeaserTeam\PwTeaser\Domain\Model\Page $parentPage
  * @param array $pages
  * @return \PwTeaserTeam\PwTeaser\Domain\Model\Page
  */
 protected function fillChildPagesRecursivley($parentPage, array $pages)
 {
     $childPages = array();
     /** @var $page \PwTeaserTeam\PwTeaser\Domain\Model\Page */
     foreach ($pages as $page) {
         if ($page->getPid() === $parentPage->getUid()) {
             $this->fillChildPagesRecursivley($page, $pages);
             $childPages[$page->getSorting()] = $page;
         }
     }
     ksort($childPages);
     $parentPage->setChildPages(array_values($childPages));
     return $parentPage;
 }