How do you change the print direction at runtime for crystal reports mail label?

Hello

How do you change the print direction at runtime for crystal reports mail label using Visual Studio 2010 and Crystal Reports Cr2010?

I understand how you do that manually on the report, but cannot find the code that would do this at runtime, short of using two reports, one designed for printing across then down and the other to print down then across

I am trying to find the code that is equivalent of the manual procdeure of select Section / Details / Layout / Print Direction

Regards
David