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How to make NSTreeController expand some items

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How to make NSTreeController expand some items

Subject: How to make NSTreeController expand some items
From: Steve Israelson <email@hidden>
Date: Fri, 16 Mar 2007 13:30:08 -0700

I want to make my NSTreeController default to showing some items expanded already. Is there some way to do so? I am using CoreData to keep a list of items to display in my outline view.

I see this question has been asked before, but apparently there was no public response.

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