How to make JComboBox display an item not in list?

hi,
i'd like a gui component which is basically a jcombobox that presents a list A,B,C,D.
The combobox is paired with another gui component which allows choosing sets of items. A etc.. represent preselected sets of items, so the user can click on A and a particular set would be selected.
My problem is what to have the JComboBox do when the user selects a set of items that is not in the preselected defaults list. It would be nice to have the JComboBox just say "Other" at the top or something, but I can't figure out a way of doing this without putting the String "Other" in the list of items..
does anyone have any idea of how to approach this? (I looked at making the JComboBox editable but this seems a little complicated?)
thanks,
asjf

Your best option and cleanest design is to have a
dummy data item in your list for "none of the above". thanks for the reply - this is what I'm doing at the moment. The problem is that I'm expecting testers to legitimately complain that selecting "None of the above" doesn't do anything, and doesn't really make sense ( it could make a random selection :o) )
i think i agree that adding functionality to do this "properly" is likely to be more work/pain than its worth..
Only an editable combobox can display something not in the list.this might help - if I could block mouse clicks to the editable area, and write to it programmatically but think this is probably quite difficult (?)
asjf

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