Actionscript 3 :: Finding The Method Name From An ExternalInterface.addCallback

Let's say we have a number of ExternalInterface.addCallback functions, like so:

ExternalInterface.addCallback( 'foo', handler );
ExternalInterface.addCallback( 'bar', handler );
ExternalInterface.addCallback( 'foobar', handler );

In the function handler I'd like to find the method name called through the external interface, such as foo, bar or foobar; is there a way? Eg:

private function handler(...args):void
{
arguments.callee.arguments[ 0 ];
}