protected function buildWhere() {
     parent::buildWhere();
     Gpf_Plugins_Engine::extensionPoint('AffiliateNetwork.modifyWhere',
     new Gpf_Common_SelectBuilderCompoundRecord($this->_selectBuilder, new Gpf_Data_Record(array('columnPrefix'), array('c'))), $this->filters);
     Gpf_Plugins_Engine::extensionPoint('CampaignGrid.modifyWhere',
     new Pap_Affiliates_Promo_SelectBuilderCompoundFilter($this->_selectBuilder, $this->filters));
 }