As the topic says, I need to create a button that is over two different panels. But I don't have a clue how to do that.

as the image shows:
* Window is first panel, and scroll list inside of it is the second panel.
* And (next/prev) button should be drawn over both of them.
* But since scroll list must have higher depth than Window, I cannot put the buttons to Window panel since then scroll list is drawn over them.
* If I put the buttons to scroll list panel, then scroll list panel clipping hides parts that are outside of it.
If someone has some sort of tips, I would be grateful.