Flex DataGrid超链接跟全选

Flex DataGrid超链接和全选
<?xml version="1.0" encoding="utf-8"?> 

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> 

<mx:Script> 

    <![CDATA[
    import mx.controls.Alert;
    import mx.logging.LogLogger;
    import mx.logging.Log; 

        import mx.collections.ArrayCollection; 

        [Bindable] 

        private var demoArr:ArrayCollection=new ArrayCollection 

            ([{orgName:'杭州',amt:3654,available:false}, 

            {orgName:'嘉兴',amt:2000,available:false}, 

            {orgName:'绍兴',amt:1000,available:false}, 

            {orgName:'金华',amt:1200,available:false}, 

            {orgName:'宁波',amt:1800,available:false}, 

            {orgName:'台州',amt:560,available:false}, 

            {orgName:'丽水',amt:2300,available:false}, 

            {orgName:'湖州',amt:2900,available:false}, 

            {orgName:'衢州',amt:2600,available:false}, 

            {orgName:'温州',amt:1600,available:false}, 

            {orgName:'舟山',amt:1300,available:false}]) 
          

        //注意调用的方法是public的    

        public function clickEvent(o:Object):void{ 
            Alert.show(o.amt);        
        } 
       public function multip():void{
        ColumnUtil.getInstance().addCheckBox(dg1.columns[0],dg1);
             ColumnUtil.getInstance().setHeadState(dg1);
        }

    ]]> 

</mx:Script> 

  

<mx:VBox width="100%"

         height="100%"

         horizontalAlign="center"> 

    <mx:DataGrid width="400"

                 height="500"

                 dataProvider="{this.demoArr}"
creationComplete="multip();"
id="dg1"> 
         <mx:columns> 
            <mx:DataGridColumn id="dc1" dataField="available"/>
            <mx:DataGridColumn headerText="单位"> 

                <mx:itemRenderer> 

                    <mx:Component> 

                        <mx:LinkButton label="{data.orgName}"

                                       color="blue"

                                       textDecoration="underline"

                                       click="outerDocument.clickEvent(data)"> 

                        </mx:LinkButton> 

                    </mx:Component> 

                </mx:itemRenderer> 

            </mx:DataGridColumn> 



            <mx:DataGridColumn headerText="金额"

                               dataField="amt"> 

            </mx:DataGridColumn> 



        </mx:columns> 

    </mx:DataGrid> 

</mx:VBox> 

  

</mx:Application>

注意：在全选时，available非常重要，这里表示默认全不选，也可以设置默认选中部分。