Just sampling your UI and it seems to be just what I am after. I have tried as the first project to use a combo box. Firstly I got the box working using your example on my site, now I am trying to bind a JSON data source to it.
the box initializes OK, but the values are filled with "undefined".
The code used to start the box is as follows:
I have checked my datasournce with JSONLint to make sure its valid.