flex mx组件和s组件的字体兼容性不一致

<?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">  

    <fx:Script>
        <![CDATA[
            protected function button1_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                this.lbText.setStyle("fontFamily", "SimSun");
                this.lbText1.setStyle("fontFamily", "SimSun");
            } 

            protected function button2_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                this.lbText.setStyle("fontFamily", "SimHei");
                this.lbText.setStyle("fontFamily", "SimHei");
            } 

            protected function button3_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                this.lbText.setStyle("fontFamily", "FangSong_GB2312");
                this.lbText1.setStyle("fontFamily", "FangSong_GB2312");
            } 

            protected function button4_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                this.lbText.setStyle("fontFamily", "KaiTi_GB2312");
                this.lbText1.setStyle("fontFamily", "KaiTi_GB2312");
            }
            protected function button5_clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                this.lbText.setStyle("fontFamily", "微软雅黑");
                this.lbText1.setStyle("fontFamily", "微软雅黑");
            } 

        ]]>
    </fx:Script>  

    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <mx:Label id="lbText" x="96" y="67" text="mx:大同市朔州市忻州市太原市-----良   轻度污染"
                     fontSize="14" />
    <s:Label id="lbText1" x="96" y="100" text="s:大同市朔州市忻州市太原市-----良   轻度污染"
               fontSize="14" />
    <s:Button  x="4" y="3" label="宋体" click="button1_clickHandler(event)" />
    <s:Button  x="82" y="3" label="黑体" click="button2_clickHandler(event)"/>
    <s:Button  x="167" y="3" label="仿宋" click="button3_clickHandler(event)"/>
    <s:Button  x="245" y="3" label="楷体" click="button4_clickHandler(event)"/>
    <s:Button  x="350" y="3" label="微软雅黑" click="button5_clickHandler(event)"/>
</s:Application>