protected function LoadManufacturer()
    {
        if (is_null($this->oActiveManufacturer) && !is_null($this->iActiveManufacturerId)) {
            $this->oActiveManufacturer = TdbShopManufacturer::GetNewInstance();
            if (!$this->oActiveManufacturer->Load($this->iActiveManufacturerId)) {
                $this->oActiveManufacturer = null;
                // unable to find manufacturer - redirect to not found page
                $this->getRedirect()->redirect($this->getPortalDomainService()->getActivePortal()->GetFieldPageNotFoundNodePageURL());
            }
        }
    }