Crystal Reports, how to, change paper size at runtime?

version: Crystal Reports XI (11.0.0.895), not the Visual Studio version.

our thick client application that calls our rpt files has printer settings, but i can override that with settings in the rpt file. like turning the page to landscape for printing out wide data. we do that by dropping in formula called "Landscape" and setting that to "True".

addition to that i need to be able to toggle between letter size and legal size based on the amount of data being demanded. i've dug with Google for answers, but i keep finding custom paper sizes (don't need) and solutions for the Visual Studio version where i would have access to the code-behind files.