public function actionCreate()
    {
        $this->layout = static::FORM_LAYOUT;
        $model = new $this->MainModel;

        if ($model->load(Yii::$app->request->post()) && $model->validate()) {
            if(empty($model->Menu_id)) {
                Yii::info('Making the new node as root');
                $model->makeRoot();
            } else {
                $parent_node = Menu::findOne($model->Menu_id);
                $model->appendTo($parent_node);

                Yii::info('Making the new node as a child of ' . $parent_node->id);
            }
            $this->saveHistory($model, $this->historyField);
            return $this->redirect(['index']);
        } else {
            return $this->render('create', [
                'model' => $model,
            ]);
        }
    }