I posted a new thread in http://www.telerik.com/community/forums/community-forums/forum-suggestions.aspx but the last posted by in the page http://www.telerik.com/community/forums/community-forums.aspx still shows the older values.
I think when a new post appears in the child its entry in the parent's grid should automatically update.
I think when a new post appears in the child its entry in the parent's grid should automatically update.