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NSCompositeXOR and Bezier Paths

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I'm trying to draw a rectangle from within a mouse event. This nearly works, 
but the rectangle is always black, irrespective of how the Compositing 
Operation is set.

[self lockFocus];

[[NSColor blackColor] set];

[[NSGraphicsContext currentContext] setCompositingOperation: 
NSCompositeXOR];  // ignored??

[[NSBezierPath bezierPathWithRect: myRect] stroke];

[self unlockFocus];

[[NSCurrentGaphicsContext] flushGraphics]; // I found this was necessary



Does the Compositing Operation have any effect on Beziers?

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NSCompositeXOR and Bezier Paths "Alex Temple" <alextemple1@btinternet.com> - 2012-01-05 23:47 +0000
  Re: NSCompositeXOR and Bezier Paths cb@mer.df.lth.se (Christian Brunschen) - 2012-01-06 10:45 +0000

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