Maybe a listboxb.requery()?

>I have 2 list boxes List Box A and List Box B
>The rowsource of List Box B is filtered based on the row source of List Box A. When I scroll thru List Box A the records in List Box B do not get updated unless I click in List Box B even thought I have a Refresh in the Interactive change event.
>
>Any ideas on what is wrong ? Thanks in advance .