Flex中创建RSS阅读器

从网上找了一个Flex中创建RSS阅读器：

<?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"

??????????? ?? creationComplete="feedRequest.send()">

??? <fx:Declarations>

??????? <mx:HTTPService

??????????? id="feedRequest"

??????????? url="http://weblogs.macromedia.com/mchotin/index.xml"

??????????? useProxy="false" />

??? </fx:Declarations>

??? <mx:Panel x="10" y="10" width="475" height="400" layout="absolute"

??????????? ? title="{feedRequest.lastResult.rss.channel.title}">

??????? <mx:DataGrid x="20" y="20" id="dgPosts" width="400"

??????????????????? ?dataProvider="{feedRequest.lastResult.rss.channel.item}">

??????????? <mx:columns>

??????????????? <mx:DataGridColumn headerText="Posts" dataField="title" />

??????????????? <mx:DataGridColumn headerText="Date" dataField="pubDate" width="150" />

??????????? </mx:columns>

??????? </mx:DataGrid>

??????? <mx:LinkButton x="20" y="225" label="Read Full Post"

??????????????????? ?? click="navigateToURL(new URLRequest(dgPosts.selectedItem.link));"/>

??????? <mx:TextArea x="20" y="175" width="400" htmlText="{dgPosts.selectedItem.description}"/>

??? </mx:Panel>

</s:Application>