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How do I show/hide a row in Flex AdvancedDataGrid with hierarchical view, but flat ArrayCollection dataProvider

I am working on a Flex AdvancedDataGrid with a flat ArrayCollection dataProvider. The requirement is that when the root nodes is closed, the root row should show a subtotal data and when the root nodes is opened, not show the subtotal data.

Anyone has a suggestion how to do it?

Thanks,

Patrick

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