RtfHeaderFooter problem

[abhisheksisodia]

I want to get "Page X of Y" type footer at the end of page using rtfheaderfooter, while writing the document and calling this code on close event of document, but all I am getting is a blank footer, code used is: -
public void onCloseDocument(PdfWriter writer, Document document) {
Paragraph p=new Paragraph();
p.add( " Page ");
p.add(new RtfPageNumber());
p.add( " of ");
p.add(new RtfTotalPageNumber());
System.out.println("ZZZZZZZZ"+new RtfTotalPageNumber());

RtfHeaderFooter footer1 = new RtfHeaderFooter(p);
writer.setFooter(footer1);}
can anybody guess what is the problem..