flex datagrid 改变

<mx:itemRenderer>
<mx:Component>
<mx:HBox horizontalAlign="center">
<mx:Script>
<![CDATA[
import com.ruijin.client.utils.ShowMessage;

protected function numericstepper1_changeHandler():void
{
data.quantity = changNum.value;
}

]]>
</mx:Script>
<mx:NumericStepper id="changNum" width="50" minimum="1" maximum="100000" value="{data.quantity}" stepSize="1"
   change="numericstepper1_changeHandler()"
   focusOut="numericstepper1_changeHandler()"/>
</mx:HBox>
</mx:Component>
</mx:itemRenderer>