i can't think of a way. a listbox control has no property that can
distinguish which of multiple columns has been clicked - the click is simply
"read" as a click in the control, period. you might consider using a subform
instead, set to Datasheet or ContinuousForms view. in datasheet view, a
right click will provide a default shortcut menu that includes sorting A-Z
or Z-A. in continuous forms view, you can write code to resort the recordset
with a click pretty much anywhere you choose.
hth
