Nimesh, thanks for the reply. I did as suggested (see screenshot), and now can make out county outlines in the states. When I identify, however, I only see the same 50 attributes shown by the original example. I also noticed that after I made the changes to the code suggested, the state name disappeared from the callout. Not sure if that's related, but bottom line, in my case changing the code didn't app earl to show attributes from additional layers.
One thing to add, I'm using Xcode 4.3.2.
Steve