<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*">

<mx:Style>
   .myText {
      fontWeight: "bold";
      fontSize: 20;
      color: #FF0000;
   }
</mx:Style>
   
   <MyMarquee id="mm" width="200" moveDuration="20000" 
       marqueeText="Thunder and lightning are rare in San Francisco." 
       textStyleName="myText" backgroundColor="0x000000" borderStyle="inset"
       borderThickness="2" />
   
   <mx:TextInput id="ti" width="200" />
   <mx:Button label="change marquee text" click="mm.marqueeText=ti.text" />
   
</mx:Application>