Hi Cheryl,
In order to achieve that you need to specify chart's
DataGruopColumn property and then using
DataManager.ValuesXColumn and
DataManager.ValuesYColumns to specify your X and Y values datasources.
I have also attached a sample project demonstrating the above approach.
More about data grouping can be read in our help topic section here:
http://www.telerik.com/help/aspnet-ajax/radchart-grouping-databound-items.html
Greetings,
Peshito
the Telerik team
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