There are several ways to achieve the desired result. For example if you use LocalDataSourceProvider you can bind its ItemsSource directly in XAML. A better approach is to create an instance of the DataProvider directly in the ViewModel and bind RadPivotGrid's DataProvider property to this instance.
I'm sending you a simple project demonstrating the second approach. Hopefully this helps.
Regards,
Rosen Vladimirov
Telerik
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