A second customization method for the custom post listings is to create a drop-down box that will allow administrators to only display items that belong to a single category at a time. This can help significantly reduce the number of entries that are shown to quickly find the desired entry.
This recipe shows how to add a filter mechanism based on the Book Review type to the listings page.
You should have already followed the Displaying additional columns in the custom post list page recipe to have a starting point for this recipe and the resulting plugin should still be active in your development site. Alternatively, you can get the resulting code (
Chapter 4/ch4-book-reviews/ch4-book-reviews-v8.php) from the downloaded code bundle and rename the file