Setting Print margins without PageSetup dialog

Hi,

In my application, I need to set the print margins but I don't want to put

up a PageSetupDialog.  I can create a new PrinterSetup object but how do I

set the margins?  The various properties are locked.

Am I missing something?  Or is there a proper way to achieve what I need 
(other than posting a PageSetupDialog)?

Thanks,
- Dale