Avoid two output displays in single report

Hi,

The requirement is that the report should have a check box called "Print Report" in the selection screen. If the box is not checked the report displays the output in ALV Grid format. If the checkbox is set, the output should be spooled to the printed and the output screen appears (ALV Grid).

How can i do the printing without the dialog box that appears using smart forms..??

Regards,

SenthilG.