problem with chart in rdlc report

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ASP.NET

I am creating rdlc with chart in asp.net 4 web site
my rdlc dir items & total item sales in duration
if I dir for long duration I have problems that all items not dir because I group them with item name
so item name dir under each column
I think if the group axis is dir vertical it 'll solve my problem
but I don't know how to do that or if there si any other solution to my problem

thanks

[Edited]Minor Edit for Spellings[/Edited]