indy's TidHTTPServer's OnAfterCommandHandler

I am using Delphi 7 pro and Indy 9.18

I would like to do some post processing after returing a response
to a HTTP Client via OnCommandGet. (the onCommandGet handler gets
called as it should)

I set a handler in the designer for OnAfterCommandHandler and
ensured CommandHandlersEnabled is true.  However, the
OnAfterCommandHandler code is not called.  What do I need to
change so that it will be?

Thanks,
-Eric