/** * Adds a validation rule. * @param mixed rule type * @param string message to display for invalid data * @param mixed optional rule arguments * @return FormControl provides a fluent interface */ public function addRule($operation, $message = NULL, $arg = NULL) { if ($operation === ':filled' and is_null($message)) { $message = 'Check %label'; } return parent::addRule($operation, $message, $arg); }