GuiTextListCtrl clipping problem inside a scroll control.

Just wondering if anyone has experienced similar... I have a pair of GuiTextListCtrls inside a scroll control, and when I populate them they have more content than would be visible in the window (hence the need for a scroll control). The problem is, only the content that is initially visible gets rendered, and then when you scroll down, everything that should be on the list is blank.

I've spent a fair amount of time digging around in the gui controls but no luck so far.