Flex中利用folderOpenIcon, folderClosedIcon和defaultLeafIcon样式改变默认文件夹和子项目图标

Flex中如何利用folderOpenIcon, folderClosedIcon和defaultLeafIcon样式改变默认文件夹和子项目图标的例子

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[
[Bindable]
[Embed("assets/folder.png")]
private var myFolderClosedIcon:Class;

[Bindable]
[Embed("assets/folder_page.png")]
private var myFolderOpenIcon:Class;

[Bindable]
[Embed("assets/arrow_right.png")]
private var myDefaultLeafIcon:Class;
]]>
</mx:Script>

<mx:XML id="dp">
<mlb>
<league label="American League">
<division label="East">
<team label="Boston" />
<team label="New York" />
<team label="Toronto" />
<team label="Baltimore" />
<team label="Tampa Bay" />
</division>
<division label="Central">
<team label="Cleveland" />
<team label="Detroit" />
<team label="Minnesota" />
<team label="Chicago" />
<team label="Kansas City" />
</division>
<division label="West">
<team label="Los Angeles" />
<team label="Seattle" />
<team label="Oakland" />
<team label="Texas" />
</division>
</league>
</mlb>
</mx:XML>

<mx:Tree id="TreeProject"
dataProvider="{dp.league}"
labelField="@label"
showRoot="true"
defaultLeafIcon="{myDefaultLeafIcon}"
folderOpenIcon="{myFolderOpenIcon}"
folderClosedIcon="{myFolderClosedIcon}"
width="320"
height="240" />

</mx:Application>