public function validate($form, $data, $group = null)
	{
	//default validation framework
	$return = parent::validate($form, $data, $group);
	if ($return === false) {
		return false;
	}

	//validation readonly or disabled fields
	foreach ($return as $row => &$value)	{
			
		if($form->getFieldAttribute($row, "readonly", false) == "true") {
			unset($return[$row]);
		} elseif($form->getFieldAttribute($row, "disabled", false) == "true") {
			unset($return[$row]);
		}
	}
	
	return $return;
		
}