2. In the same file, add a reference to the cart summary component: {include file="search_box.tpl"} {include file="departments_list.tpl"} {include file=$obj->mCategoriesCell} {include file=$obj->mCartSummaryCell} 3. Open presentation/store_front.php, and update it as highlighted in the following code snippet. This way, the StoreFront class will recognize the CartAction query string parameter. class StoreFront { public $mSiteUrl; // Define the template file for the page contents public $mContentsCell = 'first_page_contents.tpl'; // Define the template file for the categories cell public $mCategoriesCell = 'blank.tpl'; // Define the template file for the cart summary cell public $mCartSummaryCell = 'blank.tpl'; // Page title public $mPageTitle; ... public function init() { ... // Load product details page if visiting a product CHAPTER 12 ?– CREATING YOUR OWN SHOPPING CART 382 if (isset ($_GET['ProductId'])) $this->mContentsCell = 'product.