private function init_combos()
 {
     if (!$this->currencyList) {
         $currencyDataAccess = new CurrencyDataAccess($this->getDbAdapter());
         $this->currencyList = $currencyDataAccess->getComboData('currencyId', 'code');
     }
     if (!$this->companyList) {
         $companyDataAccess = new CompanyDataAccess($this->getDbAdapter());
         $this->companyList = $companyDataAccess->getComboData('companyId', 'name');
     }
     if (!$this->contactList) {
         $contactDataAccess = new ContactDataAccess($this->getDbAdapter());
         $this->contactList = $contactDataAccess->getComboData('contactId', 'name');
     }
     if (!$this->statusList) {
         $constantDataAccess = new ConstantDataAccess($this->getDbAdapter());
         $this->statusList = $constantDataAccess->getComboByName('default_status');
     }
 }
 /**
  * @return array
  */
 public function currencyCombo()
 {
     $dataAccess = new CurrencyDataAccess($this->getDbAdapter());
     return $dataAccess->getComboData('currencyId', 'code');
 }