title: Vertical alignment not working in composite mode
body: <p>The following should work according to the documentation but it's not working for me. Am I missing something?</p>
  
  <pre><code>PdfPTable rs1 = new PdfPTable(1);
  PdfPCell c = new PdfPCell();
  
  Paragraph p = new Paragraph("some text to align");
  
  c.AddElement(p);
  c.VerticalAlignment = Element.ALIGN_MIDDLE;
  
  rs1.AddCell(c);
  rs1.AddCell("more text");
  
  return rs1;
  </code></pre>