We have the need for the end user to unselect the selection in a
READ_ONLY | DROP_DOWN Combo. We can accomplish this by adding an empty
item in Combo but it has a valid index instead of -1 which would be no
selection. Has anyone found a better way around this? It would be
great if the Combo supported a style that would create this item for us.
Also by having an empty item it forces the indexes between the list
and our model to be off by 1.