I have tried many hours to make this work but I could not make it work until someone (@workerthread) reacted to one of my tweets. It can be done by using SharePoint Designer 2010 and modifying another grouping.
See this post for further details.
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The news is buzzing all around! SPD is free!
Download here
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Are you interested in building workflows with SharePoint Designer, than watch this blog post of the Microsoft SharePoint Designer Team.
