/**
  * Creates a new Page model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @param string|null $parentId
  * @param string|null $backUrl
  * @return mixed
  * @throws NotFoundHttpException
  */
 public function actionCreate($parentId = null, $backUrl = null)
 {
     $model = new Page();
     $model->loadDefaultValues();
     $model->status = Page::STATUS_PUBLISHED;
     if (isset($parentId)) {
         $parentCategory = $this->findModel($parentId);
         $model->parent_id = $parentCategory->id;
     }
     if ($model->load(Yii::$app->request->post()) && $model->saveNode()) {
         return $this->redirect($backUrl ? $backUrl : ['view', 'id' => $model->id]);
     } else {
         return $this->render('create', ['model' => $model]);
     }
 }