AX 2009 - Saving FreeTextInvoices as PDF Problem

Hi everyone,

i am trying to save Purch/Sales-Invoices by using a class. Non FreeTextInvoices work fine, it's saving the PDFs right to the place I selected in my dialog. All FreeTextInvoices however open up on screen and are not saved as PDF. Here are the essentials of my code:

_SalesFormLetter = SalesFormLetter::construct(DocumentStatus::Invoice,  false);

            _PrintJobSettings = new PrintJobSettings();
            _PrintJobSettings.setTarget(PrintMedium::File);
            _PrintJobSettings.preferredTarget(PrintMedium::File);
            _PrintJobSettings.format(PrintFormat::PDF_EMBED_FONTS);
            _PrintJobSettings.fileName(_PathToFile+_Filename);
            _PrintJobSettings.warnIfFileExists(false);
            _printJobSettings.suppressScalingMessage(true);

            _SalesFormletter.updatePrinterSettingsFormLetter(_PrintJobSettings.packPrintJobSettings(), PrintSetupOriginalCopy::Original);

            args.record(_CustInvoiceJour);
            args.caller(_SalesFormLetter);

            new MenuFunction(menuitemoutputstr(SalesInvoice), MenuItemType::Output).run(args);

Does anyone have an idea why it's opening up the free text invoices on screen instead writing those to the filesystem? I also tried the code to save Purchase Invoices and got exactly the same result.

Thanks for any help,

Marc