APEX

I am looking at the new Text Field with Autocomplete item in 4.0 and I am curious if there is a way to get it to search and display text but return an ID. For instance on page 7 (Create Customer) of the demo application. I would like the Sate field to search against and display the full state name but it needs to return the state code. So if the user search "cal" it will show them "California" but return CA during the create statement. I thought that this is how this worked in previous EA releases, but this seems different.