Maybe I am a bit thick, but I spent ages trying to get the Combo Box in Exor JMobile to work, turns out that there is a trick that doesn't seem to be written down anywhere. You click on the + sign next to Index and it opens a dialog where you can enter the onscreen and data values. It works perfectly now
I thought I would post it in case some other idiot doesn't spot the + sign and spends ages trying to get the bl**dy thing to work.