Through trial and error I finally figured out that I need to set the model field type as Picklist, not reference. I then set the reference source the same way as I had been. The field type comes into the Field Editor as Picklist as expected. I then provide labels, etc., and Field Renderer as REFPICK and all works as expected.
BTW, the suggestion to check the browser revieled that there was an unhandled field type exception which got me to thinking about things. Thanks for the suggestion.
