change combobox selection based on value in an object in flex

how do i change the item s开发者_JAVA技巧elected in a combobox selection based on a selection of a datagrid object?

Just bind the selectedItem property of the combobox to the dataGrid:

<s:ComboBox
  id="combo"
  dataProvider="{data}"
  selectedItem="{dg.selectedItem}" />

<mx:DataGrid
    id="dg"
    dataProvider="{data}"/>

use the itemClick event on the datagrid to change the selection of the combo box. You can find similar answer here Itemclick event in datagrid