private function createFields()
{
$addressContainer = new AddressFormContainer();
$this->addComponent($addressContainer, 'address');
$addressContainer->addNameControl('name', $this->cart->getName(), true);
$addressContainer->addStreetControl('street', $this->cart->getStreet(), true);
$addressContainer->addCityControl('city', $this->cart->getCity(), true);
$addressContainer->addZipControl('zip', $this->cart->getZip(), true);
$this->addSubmit('next', 'Next');
}