Robert - I've gotten it to work, at least on the first click. When I replaced the Request widget mxml file with the one you sent I also had to re-specify the Flex Module for the Request widget. When I did that, the message appeared on the first "Add to Favorites" click event.
Now, however, it's not continuing to work with subsequent clicks. In other words, the shared data message only appears when the Request widget has been opened with the first "Add to Favorites" click. Is there a separate var I need to add to the addToFavs_clickHandler function to have the shared data message appear on subsequent clicks/after the Request widget has been opened?
This is looking very good!
Thank you!
Joe