Paint problem with ScrollPane Accordion panel that has a columnHeader.

[Edvin Syse]

I have an accordion that includes ScrollPanes as panels. The ScrollPanes 
has a column header with some checkboxes and a TreeView as the view. If 
I scroll the view vertically, the background of the column header gets 
painted with the information from the treeview that was supposed to be 
scrolled out of view. When I hover the mouse over it, some parts gets 
repainted correctly, but not all. Kind of hard to explain, so I created 
a small screencast:

http://www.screenr.com/bA8s
Am I doing something wrong or could this be a bug? Seems the mic on my 
notebook is toast, the sound dissapears some places, but the video 
illustrates the problem :)

-- Edvin