[otrs] 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.