Wrong Arabic vocalization placement

I'm using iTextSharp v5.5.3.

This is my code:

/           
FontFactory.RegisterDirectory(Environment.GetFolderPath(Environment.SpecialFolder.Fonts));
            iTextSharp.text.Font font = FontFactory.GetFont("Tahoma",
BaseFont.IDENTITY_H, 15f, iTextSharp.text.Font.NORMAL, new BaseColor(0, 0,
0));
            using (Document doc = new Document(PageSize.A4))
            {
                PdfWriter writer = PdfWriter.GetInstance(doc, new
FileStream("C:\\!\\sample.pdf", FileMode.Create));
                doc.Open();
                PdfContentByte content = writer.DirectContent;
                ColumnText coltrtl = new ColumnText(content);
                coltrtl.SetSimpleColumn(doc.Left, doc.Bottom, doc.Right,
doc.Top);
                coltrtl.RunDirection = PdfWriter.RUN_DIRECTION_RTL;

                Paragraph par = new Paragraph("المُجمَّعة", font);
                coltrtl.AddElement(par);
                coltrtl.Go();

                doc.Close();
            }/

The result is:
<http://itext-general.2136553.n4.nabble.com/file/n4660462/voc3.png> 

Which is wrong. The result should be:

<http://itext-general.2136553.n4.nabble.com/file/n4660462/voc4.png> 

Changing the used font or the PDF reader will not solve the problem.



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