Itextsharp add cell image + text

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itextsharp

Hello everybody,
I need to create with c# and itextSharp a cell that has an image as a background and above that I need to write a number to it. But I don't get it.


...

But when I see the result, the image is there and the text is not.

What I have tried:

iTextSharp.text.Image fotoTi = iTextSharp.text.Image.GetInstance(AppDomain.CurrentDomain.BaseDirectory + @"\img\Arrows\TI.png");


PdfPTable tbl1;

tbl1 = new PdfPTable(1);
cell = new PdfPCell();
cell.Phrase = new Phrase(rowCalendario["L"].ToString());
cell.AddElement(fotoTF);
tbl1.AddCell(cell);