NSStatusBarButton keep highlighted
问题 As of OS X 10.10 most of NSStatusItem has been deprecated in favour of the button property, which consists of an NSStatusBarButton. It should work like a normal button but unfortunately the cell and setCell methods in NSStatusButton have also been deprecated. As a result of this I'm struggling to find a way to keep the button highlighted after it's clicked (Normally the button is highlighted on mouse down, and unhighlighted on mouse up. I want to keep it highlighted after mouse up). Calling