Issue with scrollable div in Firefox

[Magic Man]

I'm using the XP widget to display details of related records to the currently selected record. E.g. main record is the details of an organisation, the XP widget displays all staff at that organisation.

The issue I have is that, because a list maybe potentially long, I've put the contents of the XP widget into a scrollable div with a set height and overflow:auto.

This all works fine in IE but, although it displays okay in Firefox, if the XP widget is closed, part of the list scrolls up past the panel title pane. It looks like a GUI issue with Firefox since if I move the browser window off the screen and then back, it's fine.

Any thoughts?