/**
  * Checkout items screen
  */
 public function Items()
 {
     $pn_user_id = $this->request->getParameter('user_id', pInteger);
     $this->view->setVar('user_id', $pn_user_id);
     $this->view->setVar('checkout_types', ca_object_checkouts::getObjectCheckoutTypes());
     $this->render('checkout/items_html.php');
 }