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Use AsyncMessage class to send out message

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"   creationComplete="myConsumer.subscribe();">   <mx:Script>            import mx.controls.Alert;       import mx.messaging.events.MessageEvent;       import mx.messaging.messages.AsyncMessage;       private function sendMessage():void         {         var message:AsyncMessage = new AsyncMessage();         message.body = "message";         message.headers.chatUser = "Tom";         myProducer.send(message);       }       private function messageHandler(event:MessageEvent):void       {         msgLog.text += event.message.headers.chatUser + ": " + event.message.body + "\n";       }      </mx:Script>   <mx:Producer id="myProducer" destination="chat"/>   <mx:Consumer id="myConsumer" destination="chat" message="messageHandler(event)" selector=""/>        <mx:Button label="Send Message" click="sendMessage()"/>   <mx:TextArea id="msgLog" editable="false" height="200" width="100%"/>    </mx:Application>