The widgets are all happily drawing to their normal mode buffer and the rotation to different orientation is another layer on top of the toolkit right? The toolkit says it was updated so the upper layer rotates it to the screen. What if the list widget could have a callback that is invoked when the list scrolls. This callback could inform the upper layer about the new and old area boundaries so it can blit the old and rotate the new. Its not like a transparent slider widget over a list widget is all that universal to begin with.