ADD Total is Greyed Out In SSRS Tablix

reporting-services, ssrs-2008, ssrs-2008-r2, ssrs-grouping, ssrs-tablix

Solution

At the extreme bottom in visual studios you have your groups listed. Right click on the group name for which you want to add the total. Go to Add Total -> After . Refer to the image below :

Problem

I am trying to add Totals to at the end for many columns,but when i right click on the box Add Total is Greyed out,How can i enable ADD Totals? thanks in advance

Original source