Try this:
Report Form MYREPORT To Printer Prompt Preview NoConsole
You can Preview the report and when Click on printer icon of Report bar, you can select the printer and the tray you want
Other aproach is:
Use myreport.frx
Browse
* Then go to Expr field and modify to the desired PaperSource
I hope this help
Mauricio
Be fast like the Fox
Be free like the Penguin
Se Rápido como el Zorro
Se libre como el Pingüino