/**
  * Shows page by it's ID
  *
  * @param $id
  *
  * @return string
  * @throws \yii\web\NotFoundHttpException
  */
 public function actionShow($id)
 {
     $page = Page::loadModel($id, false, false);
     if ($page === null) {
         throw new NotFoundHttpException();
     }
     return $this->render('show', ['model' => $page]);
 }