NSBezierPath+UFRoundedRect.h is an Objective-C category for drawing a rounded rectangle with the ability to specify a radius for each corner.
Run git://github.com/remear/UFRoundedRect.git
Copy NSBezierPath+UFRoundedRect.h to your Xcode project
Add #import "NSBezierPath+UFRoundedRect.h". Typically this is done in an NSView subclass
Call NSBezierPath *roundedRect = [NSBezierPath fourCornerRadiusRect:dirtyRect tLRadius:8.0 tRRadius:8.0 bLRadius:8.0 bRRadius:8.0];