That's totally a different concept altogether in NAV 2013 Reports. There's a concept called GetData and SetData which handles this on which you have stuck right now. In the body part of the report and in the extreme top left corner you will find a hidden text box where you will find a code written on the visibility of the text box and that's SetData, so you need to crosscheck that first. There should be a Page Break on the Grouping too.
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