From help:
This property can be set only in form Design view .
Perhaps this is one of the from properties that can only be changed when the form is in Design View
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Bob Fitzpatrick
so does this mean It cant be done?
I think it can be done by opening the form in Design mode first, then changing the property, closing the form and saving the change, then opening the form as usual.
I think I would look at some other way of achieving the same effect. Perhaps a duplicate list box that is hidden until required.
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Bob Fitzpatrick