How to use MergeFileList in Delphi

Hi,

I'm trying to use MergeFileList in Delphi, but I can't figure it out.

Seems that I have to use the AddToFileList function, but I can't get that to work either.

Here's what I'm trying to do:

      PDFLibrary := TQuickPDF0716.Create;
      try
        PDFLibrary.UnlockKey('unlock key');

        for i := 1 to lstFiles.Count - 1 do //lstFiles is a TListBox
          pdfLibrary.AddToFileList(nFileList, lstFiles.Items); //nFileList is of type string

        ShowMessage(nFileList); //this always comes up blank

      finally
        PDFLibrary.Free;
      end;