/**
  * Join data from other tables
  */
 protected function _afterLoad()
 {
     parent::_afterLoad();
     //add details - eg frequency
     $this->mergeRelationalData($this->getTable('esendex_events/admin_sales_report_details'));
     //add stores
     $this->addRelationalData($this->getTable('esendex_sms/trigger_store'), 'store_id');
     // recipients
     $this->addRelationalData($this->getTable('esendex_events/admin_sales_report_recipients'), 'recipient', 'recipients');
 }