Arc have a walkthrough to take you through this. Looks like I'm still crawling. The walkthrough can be found here:
Everything in the walkthrough works fine but if I make the box editable each keystroke is entered as a new option. So "blah" typed into the combo box would create the following options within the combobox:
b bl bla blah
I'm sure onEnter() method needs to tie in with the onEditChange() method. But trying to incorporate this just adds blank options.
Any help appreciated.