Print Invoice direct from printer by OAF Page

I have a requirement to print a BI Publisher Report on the invoke of a Button from a OAF Page. I have followed the method suggested in the below link to integrate OAF and BI Publisher.- [login to view URL] In this scenario, I already developed Data Definition (XML) and Template (RTF) for the report and a self service page with 'Generate PDF' button. When the button is clicked the template is getting filled with the data from the database and displaying the PDF output. A dialog box with 'Open/Save/Cancel' appears before the PDF document is shown. But my requirement is to avoid this dialog box and Save option so when the button is clicked the document has to be directly sent to the printer. Is there anyway to achieve this?