How to determine where selected row is closed or open on itemClick event in AdvancedDataGrid

I have an Advan开发者_StackOverflowcedDataGrid with Hierarchical data in it. On itemClick I have to identify if the row I clicked is expanded or collapsed.

Any ideas?

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The AdvancedDataGrid has a member function isItemOpen(item:Object):Boolean. Pass it the data for the row and it will return true if the item is open, false otherwise.