自定义Flex的tree节点图标

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" >
<mx:Script>
  <![CDATA[
   import mx.collections.XMLListCollection;
 
   [Embed(source="assets/max_over.gif")]          //这是图片的相对地址
         [Bindable]
         public var OKicon:Class;
        
         [Embed(source="assets/close_over.gif")]          //这是图片的相对地址
         [Bindable]
         public var NOicon:Class;
  
   //设置不同图表          
   private function iconFun(item:Object):*
   {
    var xml:XML     = item as XML;
   
    if(xml.attribute("bool") == true)
     return OKicon;
    else if(xml.attribute("bool") == false)
     return NOicon;
   } 
  ]]>
</mx:Script>

<mx:XMLListCollection id="datatree" >
  <mx:source>
            <mx:XMLList>
                <node label="NO1" bool="false">
                    <node label="NO11" bool="false">
                        <node label="NO111" bool="false"/>
                    </node>
                    <node label="NO22" bool="true"/>
                </node>
                <node label="NO2" bool="true">
                    <node label="NO11" bool="false">
                     <node label="NO111" bool="false"/>
                    </node>
                    <node label="NO22" bool="true">
                     <node label="NO222" bool="false"/>
                    </node>
                </node>
            </mx:XMLList>
  </mx:source>
</mx:XMLListCollection>

<mx:Tree id="tree" y="40" width="100%" height="100%" fontFamily="Arial" fontSize="12"
   dataProvider="{datatree}" labelField="@label" iconFunction="iconFun" />
</mx:Application>