public function actionIndex($callback, $id)
    {
        $model = NavItemPageBlockItem::findOne($id);
        
        if (!$model) {
            throw new Exception("Unable to find item id.");
        }
        
        $block = $model->block->getObject($model->id, 'callback');

        if (!$block) {
            throw new Exception("Unable to find block object.");
        }
        
        return ObjectHelper::callMethodSanitizeArguments($block, $this->callbackToMethod($callback), Yii::$app->request->get());
    }