Thanks to Jerry Krinock, Sean McBride, and Corbin Dunn for the replies.
NSTreeController didn't seem to be a good fit for my data, so here's
how I did it:
* Add an NSMutableIndexSet* member to my controller, to store the selection.
* Add KVO-friendly accessors for that index set.
* Update the index set (using the setter) in the
outlineViewSelectionDidChange: delegate method.
--
James W. Walker, Innoventive Software LLC
<http://www.frameforge3d.com/>
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