... an update. With the fix in place, I am seeing some weird behavior. Specifically, the scrollbar of the listbox seems to bleed through the pages and is viewable on another page of my pageframe.

What happens is I click on the page tab that has a listbox within a container, then I click on another page tab that has other controls. If I click on the other page tab in an area which the scrollbar is positioned on the previous tab, the scrollbar becomes visible on the current page tab. I can actually scroll the scrollbar, but the list is still invisible. Very strange behavior. Furthermore, I can suspend and view the .visible property of the listbox and it is still set to .F. Also, I try to capture events when I am clicking, scrolling, and mousemoving around, over, and onto the ghosted scrollbar but don't see any events firing. I think I have gremlins on my form.