Export to file without "Save as" dialog

jastu

Report.Export(PDFExport);

How can i turn off "save as" dialog ? Only "Save as" dialog, I would set path and file name by code.

  // not a solution 
  PDFExport.FileName:= 'export';
  PDFExport.DefaultExt := 'pdf';
  PDFExport.FileName := AFileName;

  // this turn off additional options dialog and saveAs dialog  
  PDFExport.ShowDialog := false;

Thanks for help