public function configure()
{
$choices = array("" => "");
foreach (sfGuardUserGroupPeer::retrieveForUserWithoutCurrentRole($this->getOption('actual_user')->getLoginRole(), $this->getOption('actual_user')->getGuardUser()->getId()) as $user_role) {
$choices[$user_role->getId()] = $user_role;
}
$this->setWidget('roles', new sfWidgetFormChoice(array('choices' => $choices)));
$this->validatorSchema['roles'] = new sfValidatorChoice(array('choices' => array_keys($choices)));
$this->widgetSchema['roles']->setLabel('Change role: ');
$this->getWidgetSchema()->setNameFormat('user_role[%s]');
$this->getValidatorSchema()->setOption('allow_extra_fields', true);
}