/**
  * Creates a new BackendUser model.
  * If creation is successful, the browser will be redirected to the 'signupSucces' page.
  * @return mixed
  */
 public function actionCreate()
 {
     $model = new BackendUser();
     if ($model->load(Yii::$app->request->post()) && $model->save()) {
         return $this->redirect(array('signupsucces', 'username' => $model->username));
     } else {
         return $this->render('create', ['model' => $model]);
     }
 }