Hi Jonathan,
The code you need is in the example you pointed to. This was a custom version we helped Esri Thailand with for the Esri Asia Pacific User Conference. There are a few changes to the code, including two parameters in the configuration section of the index.html (FILTER_LIST_BY_EXTENT, and tabExtents). Those parameters are then used in functions called refreshList, and activateLayer, that are both in the main.js file of the app (http://www.esrith.com/apuc/app/js/main.js).
