MP3 Player Play/Pause?

Question

I'm making an MP3 player.  I can't get the play/pause toggle to work.  I'm not sure how to have the event be toggled on and off. Sorry, I'm a newbie to flex.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:net="flash.net.*" xmlns:media="flash.media.*" creationComplete="mySound.load(myURLReq)" themeColor="#000000" borderColor="#000000" backgroundGradientAlphas="[1.0, 1.0]" backgroundGradientColors="[#FFFFFF, #FFFFFF]">
    <mx:Script>
        <![CDATA[
            private function appInit():void {
                stage.addEventListener( KeyboardEvent.KEY_DOWN, keyPressHandler );
            private function keyPressHandler( e:KeyboardEvent ):void {
                // if the spaceBar is pressed then toggle play/pause
                if( e.charCode == 32 ) {
                    if( this.focusManager.getFocus() != toggleBtn ) {
                        this.focusManager.setFocus( toggleBtn );
                        // whatever happens when you click on the button you place here
                        // it's best to have a 'clickHandler' that calls another method
                        toggleBtnHandler();
            private function clickHandler( e:Event ):void {
                toggleBtnHandler();
            private function toggleBtnHandler():void {
                if( toggleBtn.label == "PLAY" ) {
                    toggleBtn.label = "PAUSE";
                } else {
                    toggleBtn.label = "PLAY";
        ]]>
    </mx:Script>
<mx:Button id="toggleBtn"
        x="10" y="70" toolTip="Press the spacebar to toggle label"
        click="clickHandler( event );"
        label="PLAY"/>
   <mx:Number id="myPos">0</mx:Number>
   <net:URLRequest id="myURLReq" url="01-amy_macdonald-dont_tell_me_that_its_over.mp3" />
   <media:SoundChannel id="mySoundChannel" />
   <media:Sound id="mySound" />
   <mx:Panel title="MP3 Player">
     <mx:Text id="prog" />
     <mx:ControlBar>
       <mx:Button id="play" label="PLAY" click="mySoundChannel = mySound.play(myPos, 0, null);" />
       <mx:Button id="pause" label="PAUSE" click="myPos = mySoundChannel.position; mySoundChannel.stop();" />
       <mx:Button id="stop" label="STOP" click="mySoundChannel.stop();" />
     </mx:ControlBar>
   </mx:Panel>
</mx:Application>

Answer 1

http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=15&catid=288&threadid =1248142&highlight_key=y&keyword1=mp3
http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=15&catid=288&threadid =1249411&highlight_key=y&keyword1=mp3
http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=15&catid=288&threadid =1247499&highlight_key=y&keyword1=audio