public function editProductClass($product_class_id = null)
    {
        $this->setProductClass($product_class_id);
        $this->setTitleEditProductClass();
        $this->setBreadcrumbEditProductClass();

        $this->setData('can_delete', $this->canDeleteProductClass());
        $this->setData('product_class', $this->data_product_class);

        $this->submitEditProductClass();
        $this->outputEditProductClass();
    }