NSProgressIndicator's setControlTint has no effect

I have a very simple task: change the NSProgressIndicator's color into graphite when the progress is paused by user, that is a determinate progress bar. I foun开发者_StackOverflow中文版d the method setControlTint but after using it there is just no effect. I also searched a lot there is not much clear answers. Is subclass NSProgressIndicator and do some custom drawing a must? I just wonder why this method there and no further document or discussion about proper usage.

Thanks a lot for any help :)

See doc:

Doc for NSProgressIndicator setControlTint:

Sets the receiver’s control tint.

- (void)setControlTint:(NSControlTint)controlTint

Parameters controlTint a constant indicating the desired control tint. Valid values for controlTint are described in NSCell.

Go to NSCell doc:

setControlTint:

Sets the receiver’s control tint.

- (void)setControlTint:(NSControlTint)controlTint

Parameters controlTint - an Designated Initializers value that specifies the tint of the receiver.

Designated Initializers

When subclassing NSCell you must implement all of the designated initializers. Those methods are: init, initWithCoder:, initTextCell:, and initImageCell:.

In to words you must subclassing NSProgressIndicator and implement all of the designated initializers. (see above).