actionscript 3 - change combobox selection based on value in an object in flex -

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How do I change the selected item in a Cambodia selection based on the selection of a datagrid object?

& Lt; S: combo box id = "combo" dataProvider = "{data}" selectedEyam = "{dg.selectedItem}" /> & Lt; Mx: DataGrid id = "dg" data provider = "{data}" />

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