protected function createRequiredValidator($container, $column, $record)
{
$val = new TRequiredFieldValidator();
$val->setErrorMessage('*');
$val->setControlCssClass('required-input');
$val->setCssClass('required');
$val->setControlToValidate(self::DEFAULT_ID);
$val->setValidationGroup($this->getParent()->getValidationGroup());
$val->setDisplay(TValidatorDisplayStyle::Dynamic);
$container->Controls[] = $val;
return $val;
}