OCX List Box with Multiple Values in Access Won't Work

[Morey]

I created a Parameter in CR 8.5 (string) that accepts multiple values. I'm using Access 2000 with the OCX to pass values as a parameter. I have no problem with a listbox in the Access form that has a Multi Select property equal to None. When I change the value to simple or extended, the Crystal Report doesn't get any records.

Is there anything I can do to pass multiple values in the listbox.

Thanks for your help.
Morey