/**
* Add an `option` to the `optgroup`
*
* @param string $label Option's label
* @param string $value Option's value
* @param boolean $selected Set this option as selected by default
* @return \ValidFormBuilder\SelectOption
*/
public function addField($label, $value, $selected = false, $meta = array())
{
$objOption = new SelectOption($label, $value, $selected, $meta);
$objOption->setMeta("parent", $this, true);
$this->__options->addObject($objOption);
return $objOption;
}
