public function cdnObjectPickerMultiObjectRequired($aValues)
    {
        $this->set_message(
            'cdnObjectPickerMultiObjectRequired',
            'All items must have a file set.'
        );

        foreach ($aValues as $aValue) {
            if (empty($aValue['object_id'])) {
                return false;
            }
        }

        return true;
    }