We have noticed that there is a support ticket (ID 769234) submitted with the exactly the same question, which I already answered. So I'll just include my reply here also and attach the sample project from there:
Using ObservableCollection<object> shouldn't be a problem when binging the ItemsSource of the PivotGrid.
Problem might appear if the objects in the collection don't have the same properties which are used as PropertyGroupDescriptions of the PivotGrid DataProvider - in this case the PivotGrid won't be able to visualize anything. However I have prepared a sample project which demonstrates the same scenario - PivotGrid and GridView bound to the same ObservableCollection<object> in the ViewModel. I have also included a button which changes the ItemsSource collection on click.
Hope this helps.
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