How to remove square drawn around window resize handle in an NSScrollview?

Question

I have an NSScrollview that takes up an entire window. The scrollview has a vertical scrollbar but no horizontal scrollbar. The window color is gray. The window is resizable.

Cocoa automatically draws a white square with a light gray border around the window's resize handle (right below the bottom of the vertical scroller). I would like to remove that little white square so that the gray window color and resize grooves show through. How do I do that?

Answer 1

Just a guess, but try setting the scroll view's background color to [NSColor clearColor].