Total of totals in Ticket Queue Overview

Hi,

I would like to get the "total of totals" in Ticket Queue Overview. 
Following to this link http://forums.otterhub.org/viewtopic.php?t=26896, 
I have modified 
/opt/otrs/Custom/Kernel/Output/HTML/DashboardTicketQueueOverview.pm but 
I haven't been able to modify 
/opt/otrs/Custom/Kernel/Output/HTML/Standard/AgentDashboardTicketQueueOverview.dtl.

However, only with first file modied, I don't get "Total of Totals"...

Help please.

Thanks.
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