flex datagrid 行全选

<?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" minWidth="955" minHeight="600">

	
	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
		<s:ArrayCollection id="dta">
			<fx:Object>
				<fx:id>1</fx:id>
				<fx:name>James</fx:name>
			</fx:Object>
			<fx:Object>
				<fx:id>2</fx:id>
				<fx:name>James</fx:name>
			</fx:Object>
			<fx:Object>
				<fx:id>3</fx:id>
				<fx:name>James</fx:name>
			</fx:Object>
			<fx:Object>
				<fx:id>4</fx:id>
				<fx:name>James</fx:name>
			</fx:Object>
			<fx:Object>
				<fx:id>5</fx:id>
				<fx:name>James</fx:name>
			</fx:Object>
		</s:ArrayCollection>
		
	</fx:Declarations>
	
	<fx:Script>
		<![CDATA[
			protected function del_clickHandler(event:MouseEvent):void
			{
				var length:int = display.selectedIndices.length;
//				dta.removeItemAt();
				for(var i:int =0;i<length;i++){
					dta.removeItemAt(display.selectedIndices[i]);
				}
			}
			protected function all_clickHandler(event:MouseEvent):void
			{ //下面两种都行，但具体情况这里有可能会影响到del里的display.selectedIndices。这里要注意
				//				display.selectedItems = dta.toArray();
				display.selectedItems = display.dataProvider.source;
			}
		]]>

	</fx:Script>
	<s:VGroup>
		<mx:DataGrid id="display" dataProvider="{dta}" allowMultipleSelection="true">
			
		</mx:DataGrid>
		<s:Button id="del" click="del_clickHandler(event)" label="Del"/>
		<s:Button id="all" click="all_clickHandler(event)" label="all"/>
	</s:VGroup>
	
</s:Application>