I have replied to your support ticket. For the sake of completeness, I have pasted below my answer:
RadPivotMap works as expected and it is correctly databound in this scenario. The tricky part is in the size -- you need to provide a size for the user control holding RadPivotMap. Stretch alignment will not work as the popup is displayed outside the UserControl subtree, so there is no parent control to provided bounds. I have attached a small example, based on your code. It shows RadPivotMap working as expected in this scenario.
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