Recording effort in TFS 2010 using MSF Agile 5.0 or Scrum 1.0

Hai all,

I am using the MSF Agile 5.0 template in TFS 2010. For the tasks I have created I get the text boxes to enter how many hours estimated, completed, remaining like here below

However, for work items of type user story, there is no such facility: 

Questions