Can you take a look at the DataProvider Refresh
section on the Populating with Data documentation of RadPivotGrid? Does that work for you?
Also, the pivot grid control works with any collection that implements the IEnumerable interfrace so you can use ObservableCollection. See the First Look demo of RadPivotGrid in the demos app. Note that this example doesn't list all required files in the application so to get them and what happens you will need to get the demos app source solution
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