TAB Stop on MAC

When Tabbing through my running app on the MAC it will not stop on a PushButton I can transfer the exact same code to Windows 8.1 and it works any ideas what I maybe doing wrong?

Turn on full keyboard access
Buttons & several other UI elements do NOT get focus on the Mac like they do on Windows

Thank you the PushButton are now working but do not show focus when they are tabbed to.

Mac behavior won’t be the same as Windows
Nor should it be

I thought there was a very small/slight light blue focus when you did that with the Aqua interface. Can’t say I’ve tried it since they refined interfaces or that whole Yosemite thing.

Thank you all