[flexcoders] xml result is null in event.result, but is visible in event.message

[TCash21]

I have a simple script checking whether a cookie exists or not:

<?php

$output = "<session>";
if (isset($_COOKIE['tokenID']))
{
        $output .= "yes";
}
else
{
        $output .= "no";
}       

$output .= "</session>";

print ($output);

?>

In Flex, I just want to check the result like this:
private function checkSession(event:ResultEvent):void
{
     Alert.show(event.result.success);
}
This returns a blank Alert with no result.

But when I use Alert.show(event.message.toString());
I can see the results in body = "<session>yes</session>"

I've also tried it in e4x format with no luck.  Yet I've had no
trouble returning xml from other scripts.