kmail-1.10.90 (kde 4.2 beta1) help needed

Neal Becker <[email protected]>
Newsgroups gmane.comp.kde.users.pim
Message-ID <[email protected]>
Just trying out new kde 4.2 beta 1.

In kmail, the message summary is show sorted by threads, alphabetically by author who started the thread.

How can I change it back to the older behavior, show threads by date?
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