Many people have asked on How-To enable TFS 2010 style feature on the upgraded projects. Please visit following articles from Lakhminder which explains the process
TFS 2010: Enable Test Case Management for upgraded Team Projects
Create TFS 2010 Reports for upgraded Team projects.
Enable TFS 2010 Style dashboard and Excel Reports on MSF Agile 4.2 or MSF CMMI 4.2 site collections
Author: Lakhminder Singh