Thank you for writing.
Currently, RadPivotGrid for WinForms does not support such a functionality. I have added this to our feedback portal
. Feel free to add your vote for it and subscribe for status changes here: http://feedback.telerik.com/Project/154/Feedback/Details/122542
I have updated your Telerik Points
for this request.
Meanwhile, you will need to expand the desired groups manually. The following threads suggests one possible approach to do that: http://www.telerik.com/forums/expand-collapse-programmatically
I hope that you find this information useful.
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