How is the Catalog Button implemented in Chapter 2?
The sample code that comes with book has a Catalog Button that takes you back to the catalog from the detail page. How is this implemented? The books states, 'The application should take you to the detail page for that item. Tapping the Catalog button in the navigation bar should take you back to the catalog.' My detail page loads with the no issue but I am missing the Catalog Button.
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