/**
  * Enter description here ...
  * 
  * @param Zend_Form_Element $field
  * @param unknown_type $label
  */
 public function setSelectDefaultOption(Zend_Form_Element $field, $label = null)
 {
     return $field->addMultiOption(self::SELECT_DEFAULT_VALUE, sprintf(self::SELECT_DEFAULT_LABEL, $label ? $label : $field->getLabel()));
 }