how do I do things like this http://i.imgur.com/30oMnDn.png or like http://i.imgur.com/vHbin4P.png,
the buttons are draw in the window titile bar.
It'd require some tricky hackery to overlay NSViews.. It's non trivial but also something that's commonly done so we'll probably want to support this, just can't give you a promise about when that'll be. (Actually, it's something we'll probably want to use ourselves here at ROLI so that'll make it happen faster)