Botão no datagrid

E ai galera, tudo bom?

tô começando a aprender Flex agora e tô gostando, mas tô com um problema

quero por um botão no datagrid que se repita a cada linha, para executar uma função

já tentei de toda forma!

olha ai meu código mxml

valeu!

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:dataservice="services.dataservice.*"
xmlns:testeservice="services.testeservice.*"
xmlns:loginservice="services.loginservice.*"
width="1019" height="628" minWidth="955" minHeight="600" backgroundColor="#A6A1A1"
pageTitle="Login">
<fx:Script>
<![CDATA[

 import mx.controls.Alert;
 import mx.events.FlexEvent;

 import spark.events.GridSelectionEvent;

 protected function dataGrid_creationCompleteHandler(event:FlexEvent):void
 {
 getListaResult.token = dataService.getLista();
 }

 protected function dataGrid_selectionChangeHandler(event:GridSelectionEvent):void
 {
 // TODO Auto-generated method stub

 }

 ]]>
	</fx:Script>

	<fx:Declarations>
 <s:CallResponder id="getListaResult"/>
 <dataservice:DataService id="dataService"
 fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)"
 showBusyCursor="true"/>
 <!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<s:DataGrid id="dataGrid" x="208" y="127"
 creationComplete="dataGrid_creationCompleteHandler(event)" requestedRowCount="4"
 selectionChange="dataGrid_selectionChangeHandler(event)">
 <s:columns>
 <s:ArrayList>
 <s:GridColumn dataField="id" headerText="id"></s:GridColumn>
 <s:GridColumn dataField="nome" headerText="nome"></s:GridColumn>
 <s:GridColumn dataField="senha" headerText="senha"></s:GridColumn>
 </s:ArrayList>
 </s:columns>
 <s:typicalItem>
 <fx:Object id="id1" nome="nome1" senha="senha1"></fx:Object>
 </s:typicalItem>
 <s:AsyncListView list="{getListaResult.lastResult}"/>

	</s:DataGrid>

</s:Application>