I'm talking about the navigation area on the left side of iTunes for the library and playlists. I am wondering if this is a built-in class (which I could not find documented) or something custom implemented by Apple.
I am working with a mac application where I want to enable this type of navigation. I want people to “collapse” categories using triangles. Do I need to write a custom implementation, or can I use some control in Interface Builder or in some open source library?
Thanks!
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