public function toOptionArray() { if (null === $this->_options) { $this->_options = array(); $reportTypeList = Creativestyle_CheckoutByAmazon_Model_Api_Model_Marketplace_Reports_Abstract::getReportTypes(); foreach ($reportTypeList as $reportTypeCode => $reportTypeLabel) { $this->_options[] = array('value' => $reportTypeCode, 'label' => Mage::helper('checkoutbyamazon')->__($reportTypeLabel)); } } return $this->_options; }