public function configure()
 {
     $this->widgetSchema['type'] = new sfWidgetFormChoice(array('choices' => EmailParser::getTypeChoices()));
     $this->validatorSchema['description_regexp'] = new sfValidatorString(array('max_length' => 255, 'required' => false));
     $this->widgetSchema['sample'] = new sfWidgetFormTextarea();
 }