Simple mouseover effect on NSButton

Question

I am creating a custom NSButtonCell for a custom rendering.

Now, I want to have different aspect depending if the mouse is over the button or not. How can

Answer 1

a good starting point, declared in NSResponder:

- (void)mouseEntered:(NSEvent *)theEvent;
- (void)mouseExited:(NSEvent *)theEvent;

specifically, the button cell's container (not the cell itself) is the NSResponder.