AdvancedDataGrid, colonne avec bouton et data

Bonjour,

dans mon AdvancedDataGrid j'ai besoin d'avoir une colonne avec des boutons, quand je clique sur un dès bouton j'ai besoin de savoir dans la fonction quelle ligne (son index) du dataProvider cela concerne, j'ai du mal là :calim2:

Merci pour votre aide.
Code:
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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				layout="absolute">
 
	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
 
			public function onClick(item:Object):void
			{
				Alert.show(item.text);
 
				// C'est ici que je souhaite connaitre la ligne du dataProvider 
			}
 
			public function create():void
			{
				var array:Array=[{text: "Text1", buttonLabel: "Bt1"}, {text: "Text2", buttonLabel: "Bt2"}]
				ad.dataProvider=new ArrayCollection(array);
			}
		]]>
	</mx:Script>
 
	<mx:ArrayCollection id="arrColl">
		<mx:source>
			<mx:Array>
				<mx:Object holidayName="New Years"
						   holidayDate="2010/1/1"/>
				<mx:Object holidayName="Martin Luther King, Jr. Day"
						   holidayDate="2010/1/18"/>
 
				<mx:Object holidayName="Groundhog Day"
						   holidayDate="2010/2/2"/>
				<mx:Object holidayName="Chinese New Year"
						   holidayDate="2010/2/14"/>
				<mx:Object holidayName="Valentine's Day"
						   holidayDate="2010/2/14"/>
				<mx:Object holidayName="President's Day"
						   holidayDate="2010/2/15"/>
				<mx:Object holidayName="Ash Wednesday"
						   holidayDate="2010/2/17"/>
 
				<mx:Object holidayName="Daylight Saving Time starts"
						   holidayDate="2010/3/14"/>
				<mx:Object holidayName="St. Patrick's Day"
						   holidayDate="2010/3/17"/>
				<mx:Object holidayName="First Day of Spring"
						   holidayDate="2010/3/20"/>
 
				<mx:Object holidayName="April Fool's Day"
						   holidayDate="2010/4/1"/>
				<mx:Object holidayName="Easter"
						   holidayDate="2010/4/4"/>
				<mx:Object holidayName="Administrative Professional's Day"
						   holidayDate="2010/4/21"/>
				<mx:Object holidayName="Earth Day"
						   holidayDate="2010/4/22"/>
 
				<mx:Object holidayName="Cinco De Mayo"
						   holidayDate="2010/5/5"/>
				<mx:Object holidayName="Mothers Day"
						   holidayDate="2010/5/9"/>
				<mx:Object holidayName="Armed Forces Day"
						   holidayDate="2010/5/15"/>
				<mx:Object holidayName="Memorial Day"
						   holidayDate="2010/5/31"/>
 
				<mx:Object holidayName="Flag Day"
						   holidayDate="2010/6/14"/>
				<mx:Object holidayName="Father's Day"
						   holidayDate="2010/6/20"/>
				<mx:Object holidayName="Summer Begins"
						   holidayDate="2010/6/21"/>
 
				<mx:Object holidayName="Independence Day/July 4th"
						   holidayDate="2010/7/4"/>
 
				<mx:Object holidayName="Labor Day"
						   holidayDate="2010/9/6"/>
				<mx:Object holidayName="Grandparents Day"
						   holidayDate="2010/9/12"/>
				<mx:Object holidayName="First Day of Autumn"
						   holidayDate="2010/9/23"/>
 
				<mx:Object holidayName="Columbus Day"
						   holidayDate="2010/10/11"/>
				<mx:Object holidayName="United Nations Day"
						   holidayDate="2010/10/24"/>
				<mx:Object holidayName="Halloween"
						   holidayDate="2010/10/31"/>
 
				<mx:Object holidayName="All Saints' Day"
						   holidayDate="2010/11/1"/>
				<mx:Object holidayName="Daylight Saving Time Ends"
						   holidayDate="2010/11/7"/>
				<mx:Object holidayName="Veteran's Day"
						   holidayDate="2010/11/11"/>
				<mx:Object holidayName="Thanksgiving"
						   holidayDate="2010/11/25"/>
 
				<mx:Object holidayName="Wright Brothers Day"
						   holidayDate="2010/12/17"/>
				<mx:Object holidayName="First Day Winter"
						   holidayDate="2010/12/21"/>
				<mx:Object holidayName="Christmas"
						   holidayDate="2010/12/25"/>
				<mx:Object holidayName="New Years Eve"
						   holidayDate="2010/12/31"/>
			</mx:Array>
		</mx:source>
	</mx:ArrayCollection>
 
	<mx:AdvancedDataGrid id="ad"
						 dataProvider="{arrColl}"
						 width="100%"
						 creationComplete="create();">
		<mx:groupedColumns>
 
			<mx:AdvancedDataGridColumnGroup>
				<mx:AdvancedDataGridColumn dataField="holidayName"/>
 
				<mx:AdvancedDataGridColumn>
					<mx:itemRenderer>
						<mx:Component>
							<mx:Button label="{data.buttonLabel}"
									   click="{outerDocument.onClick(data)}"/>
						</mx:Component>
					</mx:itemRenderer>
				</mx:AdvancedDataGridColumn>
			</mx:AdvancedDataGridColumnGroup>
		</mx:groupedColumns>
	</mx:AdvancedDataGrid>
 
</mx:Application>