I think that the CornerRounder is not appropriate. It's a hack like its class
comment sais. ;-)

What about using the methods from FormCanvas to draw rounded rectangles? The
result would be nicer because we could play with anti-aliasing:

<http://forum.world.st/file/n4807342/window-corners.png> 

BUT: Pharo dismissed that interface from canvas and I was wondering, how
portable it is. Canvas does not have it. Only FormCanvas has it:

frameAndFillRoundRect: aRectangle radius: cornerRadius fillStyle: fillStyle
borderWidth: bw borderColor: bc
frameRoundRect: aRectangle radius: radius width: borderWidth color:
borderColor
fillRoundRect: aRectangle radius: radius fillStyle: fillStyle

At the moment, PluggableButtons round their corners _without_ the
CornerRounder but by using the canvas interface to draw rounded rectangles.

Is performance an issue? Well, the corner rounder is quite hacky...

Best,
Marcel

P.S.: The anti-aliasing trick works like this and may be slow:

	aCanvas
		frameRoundRect: self bounds
		radius: 7
		width: self borderWidth
		color: (self borderColor alpha: 0.5).

	aCanvas
		frameAndFillRoundRect: self bounds
		radius: 8
		fillStyle: self fillStyle
		borderWidth: self borderWidth
		borderColor: self borderColor.
		
	aCanvas
		frameRoundRect: self bounds
		radius: 9
		width: self borderWidth
		color: (self borderColor alpha: 0.3)



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