Flex :: Identify The Original Message That Triggers MessageFaultEvent?

I'm using BlazeDS to send messages in Flex. Inside the UI component, I defined a producer like the one below:

<mx:Producer id="producer"
destination="chat"
fault="faultHandler(event);"/>

I was wondering inside faultHandler how I'm able to identify what message causes the error. As it seems there's no way to get the reference to the original message.This is the code snippet how the message is constructed and sent.

private function sendMessage():void {
var message:AsyncMessage = new AsyncMessage();
message.body = userName.text + ": " + input.text;

[code]....