Returns an NSColor object that represents a blend between the receiver and the highlight color returned by highlightColor.
Original signature is '- (NSColor *)highlightWithLevel:( CGFloat)highlightLevel'
Available in Mac OS X v10.0 and later.


The new NSColor object. Returns nil if the colors can�t be converted.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)