protected function GetStepAsAjax($sStepName = null)
    {
        $sHTML = '';
        if (is_null($sStepName)) {
            $sStepName = $this->global->GetUserData('sStepName');
        }
        $oStep = TdbShopOrderStep::GetStep($sStepName);
        if ($oStep) {
            $sModuleSpotName = $this->sModuleSpotName;
            $sHTML = $oStep->Render($sModuleSpotName);
        }

        return $sHTML;
    }