public static function validateValid(IFormControl $control)
 {
     $res = $control->getExtension()->validate($control->hash, $control->responce);
     if ($res) {
         return true;
     } else {
         if ($control->show_captcha_error) {
             foreach ($control->getExtension()->getErrors() as $error) {
                 $control->addError($error);
             }
         }
         $control->error = $control->getExtension()->getErrors();
         return false;
     }
 }