Hello Feng,
One possible reason for this behavior might be a completely different structure of the data sent to the RadPivotMap control when changing the selection in the combobox. In this case, you will need to re-configure the RadPivotMap, so that its GroupDefinitions match the data. If the configuration seems to be correct, please send us a small example showing the problem, so that we can investigate it. Thanks.
Regards,
Ves
the Telerik team
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