[AccessD] Setting ListIndex value (A97)

hi guys,
 
I need to set the selected item of a combobox to a random value when
user clicks a commandbutton.  e.g. [Select random gift] button sets the
Gift: combo next to it to a random value (between 1 and listcount-1!)
 
Since listindex is readonly can anyone tell me how to do this?
 
tia
bruce
 
 
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