Биндинг между компонентами

[zlatko]

Также, как вариант :

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
  <mx:Script>
    <![CDATA[
      [Bindable]
      private var _ds:XMLList = XMLList('<item id="1" name="name1" desc="aaa" /><item id="2" name="name2" desc="bbb" /><item id="3" name="name3" desc="ccc" /><item id="4" name="name4" desc="ddd" />');
    ]]>
  </mx:Script>
  <mx:HBox>
    <mx:DataGrid id="dg" dataProvider="{_ds}" selectedIndex="{cmb.selectedIndex}">
      <mx:columns>
        <mx:DataGridColumn headerText="Column 1" dataField="@id"/>
        <mx:DataGridColumn headerText="Column 2" dataField="@name"/>
        <mx:DataGridColumn headerText="Column 3" dataField="@desc"/>
      </mx:columns>
    </mx:DataGrid>      
    <mx:ComboBox id="cmb" dataProvider="{_ds}" labelField="@name" selectedIndex="{dg.selectedIndex}"/>
  </mx:HBox>
</mx:Application>