In the WWDC '14 sessions, it is explained how to add subviews to a NSWindow title bar, which helps defining a custom height of the title bar.
However, I cannot find a way to center the window control buttons (traffic lights) vertically centered.
I tried setting their frames in NSWindow's setFrame:display:;, but weirdly, during resizing, the buttons stick to the top edge of the title bar.
Did anyone find a proper technique on how to center these buttons?
(I do not want to use INAppStoreWindow this time.)
