如何在Flex 4中提供Spark列表中项目的链接？

<s:List id="lst"
            labelField="@label"
            change="lst_changeHandler(event)"
            horizontalCenter="0" verticalCenter="0">
        <s:dataProvider>
            <s:XMLListCollection>
                <fx:XMLList xmlns="">
                    <node label="One" />
                    <node label="Two" />
                    <node label="Three" />
                    <node label="Four" />
                    <node label="Five" />
                    <node label="Six" />
                    <node label="Seven" />
                    <node label="Eight" />
                    <node label="Nine" />
                </fx:XMLList>
            </s:XMLListCollection>
        </s:dataProvider>
    </s:List>

protected function lst_changeHandler(event:IndexChangeEvent):void
            {
               Alert.show(event.target.selectedItem); 

        }
<s:List id="lst"
            labelField="@label