print subreport on server side

I need to print sub report on the server side. I have a crystal report with one subreport. I am using printtoprinter function to print report on the server side. When i use printtoprinter function its printing the main report and i couldn't use the same printtoprinter function to print report . When i gave printtoprinter function for subreport document object its giving an error "Not supported with in subreports".

Some one please help me. Its very ungent....

Regards,
Anoop K