/**
  * @param array $properties
  * @return string
  */
 public function Field($properties = array())
 {
     foreach ($this->getChildren() as $field) {
         /** @var FormField $field */
         $field->setDisabled($this->isDisabled());
         $field->setReadonly($this->IsReadonly());
         $field->setForm($this->getForm());
     }
     return parent::Field($properties);
 }