how to change subreport path in rdlc at runtime

Hello to everyone.
Any Idea to change subreport path at runtime.
For Example I have a parameter and based on it i have to show subreport Header1 or Header2 or Header3, source is same but design changes.

i tried this one:

http://social.msdn.microsoft.com/Forums/en-US/a3b034bb-578b-4161-aaf6-403b43a9fede/adding-subreport-rdlc?forum=vsreportcontrols

but didn't work.
thnx.