<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:text="flash.text.*"  xmlns:button="com.cb.*" viewSourceURL="srcview/index.html">
    <mx:Style source="css/styles.css"/>
    <mx:HBox>
        <mx:Button label="Click Me" />
        <button:BlackButton label="Click Me" />    
        <button:BlackButton label="Click Me" styleName="playButton" />        
    </mx:HBox>
</mx:Application>