Thank you Hans, it works perfectly!!!
I'm still having problems with the table borders, the example I previously post was not the correct one for this issue. Here is the code I use to test the tables and cells borders.
Thanks,
Sebastian
string st = @"
<html>
<body bgcolor=""#FFFFFF"" text=""#000000"">
<table cellspacing=""0"" cellpadding=""0"" cols=""4"">
<tr align=""left"" valign=""top"">
<td width=""25%"" style=""border-bottom: 1px solid black; border-left: 1px solid black;border-top: 1px solid black; border-right: 1px solid black;"">
<div align=""center"" style=""text-indent: 0pt; margin-left: 0pt; margin-top: 3pt; margin-bottom: 7pt; margin-right: 0pt; line-height: 100%;""><span style=""font-family: 'Arial'; font-size: 10pt;""><b>XXXXXXX</b></span></div>
</td>
<td width=""25%"" style=""border-bottom: 1px solid black; border-left: 1px solid black; border-top: 1px solid black; border-right: 1px solid black;"">
<div align=""center"" style=""text-indent: 0pt; margin-left: 0pt; margin-top: 3pt; margin-bottom: 7pt; margin-right: 0pt; line-height: 100%;""><span style=""font-family: 'Arial'; font-size: 10pt;""><b>YYYYYYYYYY</b></span></div>
</td>
<td width=""25%"" style=""border-bottom: 1px solid black; border-left: 1px solid black; border-top: 1px solid black; border-right: 1px solid black;"">
<div align=""center"" style=""text-indent: 0pt; margin-left: 0pt; margin-top: 3pt; margin-bottom: 7pt; margin-right: 0pt; line-height: 100%;""><span style=""font-family: 'Arial'; font-size: 10pt;""><b>ZZZZZZZZZZZZZ</b></span></div>
</td>
<td width=""25%"" style=""border-bottom: 1px solid black; border-left: 1px solid black; border-top: 1px solid black; border-right: 1px solid black;"">
<div align=""center"" style=""text-indent: 0pt; margin-left: 0pt; margin-top: 3pt; margin-bottom: 7pt; margin-right: 0pt; line-height: 100%;""><span style=""font-family: 'Arial'; font-size: 10pt;""><b>WWWWWWWW WWWWWW WWWWW</b></span></div>
</td>
</tr>
</table>
</body>
</html>";
Pdf pdfAux = new Pdf();
StringReader lectorAuxiliar = new StringReader(st);
pdfAux.BindHTML(lectorAuxiliar);
pdfAux.Save("c:/test.pdf");