osx - NSTabView styled like iTunes for Yosemite -

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i'm trying build nstabview styled in same way in nspanel/nswindow in itunes. pops when edit track.

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when add nstabview, appears tinted , bordered rect

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i've tried can think of remove rect, or set transparent. has 1 found solution this? pointers in right direction extremely helpful.

you can create tabless nstabview , can add nssegmentedcontrol select active tab.

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