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

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'开发者_StackOverflows 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?

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

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Send the window a setShowsResizeIndicator:NO and draw your own indicator as you like...