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Correct implementation of undoManagerForTextView

My app has two separate text views (one in the main window, another in a drawer). Each has its own separate delegate, and I want each to have its own undo manager. (So that they can separately trigger an Unsaved Changes warning.) The trouble is, I can't figure out the correct implementation of the NSTextView delegate method:

- (NSUndoManager *)undoManagerForTextView:(NSTextView *)aTextView
{
return (what?);
}

There's no illumination in the FM, and I'm further confused by a reference by Bill Cheeseman (Omni archives) to this as an NSWindow delegate method, which it clearly isn't.
-Jeremy

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