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Due to ownership over the items owners can manage their's posts. Other users ( except the admin) cannot manage posts that has not been created by them. The screenshots below represents this situation, where one user cannot edit the other user post - edit, delete, reply buttons are available only for this user post and this is the reason why there are "reply" buttons of some of the posts.
I checked this under 3.5 SP1. Also, send you a reply to your ticket request,
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the Telerik team
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