[flexcoders] var token:AsyncToken = service.[str](); how to get this working?

[MicC]

When used conventionally - var token:AsyncToken = 
service.Sel_all_mgrs(); - this is service.function, right?

var str:String = 'Sel_all_mgrs';
var token:AsyncToken =  service.[str]();
  token.addResponder(this.responder);

What is the correct code to get the above working? TIA,

Mic.