Argh! I have like 400 versions of this application. Updating the really really old one left some bugs I had fixed.
This was a mistake
The 3rd ref should have a selector of 'mainnav' (no # and all lower)
Next, add four controller references. In Config, find the References property. Click the add button on the right under Value ("+") to add the first controller reference. When prompted name it dataList and set its selector to #dataList. Add three additional controller references using the same technique, as follows:
Name the third reference mainNav and set its selector to #mainNav.