how does one get the look of the tab buttons as they appear in iWork '09 Inspector NSPanel?
Closest I could get is NSSegmentedControl with "Small Square" style. Unfortunately, at least under Snow Leopard that results in grayed selection instead of blue selection.
Any ideas what Apple did to get the bluish aqua-style selection in various iWork '09 Inspector NSPanels?
The top icon bar is a Radio Group, which is actually a NSMatrix filled with NSButtonCells. You can check this using the application UIElementInspector.app, which is a sample code provided with XCode.
The selected cell displays its alternate image, other cells display their image.