PDF Printer

"Then, a Process button will be click in order to preview the report in a pdf format. "

Even if it's an old post (Nov 25 '08) and because it appears on google search and has no best answer yet, I have another possible answer:

1). In your OS (windows) install a virtual PDF printer (I use PDFCreator)
2). Make sure that the PDF Printer is set to display the .pdf file ! (in PDFCreator,...