Index: library/Zend/Form/Element/Button.php =================================================================== --- library/Zend/Form/Element/Button.php (revision 25167) +++ library/Zend/Form/Element/Button.php (working copy) @@ -39,4 +39,18 @@ * @var string */ public $helper = 'formButton'; + + /** + * Validate element value (pseudo) + * + * There is no need to reset the value + * + * @param mixed $value Is always ignored + * @param mixed $context Is always ignored + * @return boolean Returns always TRUE + */ + public function isValid($value, $context = null) + { + return true; + } }