Converting HTTPServer Indy 9 to Indy 10

I'm trying to convert an application that uses IDHTTPserver from Indy 9 to
Indy 10 (Delphi 7).  I found the article 'Upgrading to Indy 10' from the
Borland Conference and followed the very helpful instructions to make the
necessary changes.

The program compiles and runs but ARequestInfo.Unparsedparams, which I
previously used to access the incoming XML, is returning blank now.
AResponseInfo.ContentText seems to be working to send the response back.
The code is something like this:

procedure TfmStockCheck.HTTPServerCommandGet(AContext: TIdContext;
  ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
begin
....
          with aContext.Connection.IOhandler do
           begin
            Try
              ProcessHTTPRequest(ARequestInfo.Unparsedparams,aContext);
            Finally
....
            End;
            end;
end;

procedure TfmStockCheck.ProcessHTTPRequest(REcXMLString : String; aContext :
tidContext);
begin
//process RecXMLString; it appears aContext is no longer used in this
procedure
end;

Thanks for any help.
Trina J