what is the best of showing a NSDictionary of NSArrays?

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I have a NSDictionary that each key refers to an NSArray object, I want to show the contents on a Cocoa APP on mac OSX 10.5, What is the best solution to this?

Maybe NSTreecontroller?

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These kinds of tree structures are well displayed by components like NSOutlineView or NSBrowser.

Please also have a look to Outline view programming guide by Apple, which introduces the subject (at least for outline views).