Retro button style in OSX cocoa

While developing a 'breadcrumb' or NSPathControl type class, I created some buttons programmatically -  initially very quick and dirty;  [[NSButton alloc] initWithFrame] and not bothering to set anything.

This may be the first time I've ever done that because I wasn't prepared for what happened:

It takes me back to Amiga Workbench, and some interesting times that I had to use Windows at various day jobs.

It makes sense; I haven't set any button type or border style. But I would have thought I'd get the basic push button (the ones you get for OK and Cancel in alerts etc).

This isn't a complaint at all, I'm just bemused to see OSX drawing these retro-looking buttons.

[Update]  it's not looking bad...