Flex中如何给RichTextEditor的标题添加一个Icon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("RichTextEditor.png")] 
            private var RichTextEditorIcon:Class; 
        ]]> 
    </mx:Script> 
  
    <mx:RichTextEditor id="richTextEditor" 
            title="Rich Text Editor" 
            titleIcon="{RichTextEditorIcon}" /> 
  
</mx:Application>