flex 4里一个传统的闪烁效果

flex 4里一个传统的闪烁效果,笔记如下:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/08/13/creating-blinking-text-on-a-spark-richtext-control-in-flex-4/ -->
<s:Application name="Spark_RichText_blink_test"
   xmlns:fx="http://ns.adobe.com/mxml/2009"
   xmlns:s="library://ns.adobe.com/flex/spark"
   xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:HorizontalLayout horizontalAlign="center" verticalAlign="middle" />
</s:layout>

<fx:Declarations>
<s:Animate id="fader"
   duration="500"
   repeatBehavior="reverse"
   repeatCount="0"
   target="{lbl}">
<s:SimpleMotionPath property="alpha"
valueFrom="1.0" valueTo="0.0" />
</s:Animate>
</fx:Declarations>

<s:Label id="lbl"
text="BLINKING TEXT, I HATE YOU!"
color="red"
fontSize="32"
creationComplete="fader.play();" />

</s:Application>