listbox-combobox category

[GUS]

is it possible to have in a combobox or listbox categories that cannot be
selected.
example
combobox list must appear as :

names
gus
jim
jhon
david
fruits
banana
orange
games
Tetris
tennis
basket

user can only select the values (jim,john,orange, tennis etc)not categories
(names,fruits,games)
Is this possible.

 

[Tom Ogilvy]

Not by using a setting.

You could design your code to unselect them.