list control turning grey and contents disappearing

I've got a list control on a dialog that's loaded into a tab. When the left and right arrows are pressed, I want to move items around in this list. The moving around works, but the contents of the list disappear and turn grey -- as if the tab background is being drawn on top of it. In fact, this is almost definitely what's happening; if the tab is shortened so that it doesn't cover the entire list control, the uncovered portion draws. It looks like a Z-order issue. Anyone ever encounter anything like this?

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