ftp.nice.ch/pub/next/developer/objc/appkit/ChangingAlert.N.bs.tar.gz#/ChangingAlert/MyButton.h

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#import <appkit/appkit.h>

@interface MyButton:Button
{
    id                  targetButton;
    id                  selftargetButton;
}

- setTargetButton:sender :othersender;
    -mouseEntered:(NXEvent *)theEvent;
    -initFrame:(const NXRect *)frameRect title:(const char *)aString tag:(int)anInt target:anObject action:(SEL)aSelector key:(unsigned short)charCode enabled:(BOOL)flag;
    -(BOOL)acceptsFirstResponder;

    @end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.