/**
  * Inits messages.
  */
 private static function _set_messages()
 {
     // Set outside in /admin.php
     self::$messages = wpcf_admin_validation_messages();
 }
 /**
  * Validates element.
  * 
  * @param type $element 
  */
 public function validateElement(&$element)
 {
     $check = Toolset_Validate::check($element['#validate'], $element['#value']);
     if (isset($check['error'])) {
         $this->_errors = true;
         $element['#error'] = $check['message'];
     }
 }