code: def responderForName(self, instance, commandName):
          
          method = super(_AMPExposer, self).get(instance, commandName)
          return method
docs: When resolving a command to a method from the wire, the information
          available is the command's name; look up a command.
  
          @param instance: an instance of a class who has methods exposed via
          this exposer's L{_AMPExposer.expose} method.
  
          @param commandName: the C{commandName} attribute of a L{Command}
          exposed on the given instance.
  
          @return: a bound method with a C{command} attribute.