I'm not sure what you mean by "iTunes-like tree menu". The method
used for lazily creating hierarchical menus is -[NSObject
menu:updateItem:atIndex:shouldCancel:].
Sorry, I don't actually mean a menu, but I'd like to bind an
outline view to a Core Data model, and have it take on the
graphical style and appearance of the outline view in iTunes.
How would I go about doing this?
The term you want to use in Google is "Source list". "Gradient
NSTableView" has another set of interesting results.