See: http://bugzilla.gnome.org/show_bug.cgi?id=148558 http://bugzilla.gnome.org/show_bug.cgi?id=141937 Short answer: can't really be done at present without probing around in stuff you probably shouldn't. Bug 148558 has some good discussion of how to do it. Funny you should mention Evolution -- it has its own custom Treeview I believe, I looked at that when I ran into the problem, only to discover it had its own widget. John Lorenzo Gil Sanchez wrote:
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