else if (this.cellEvent == null)
this.cellEvent = cellEvent;
else if (this.cellEvent instanceof PdfPCellEventForwarder)
((PdfPCellEventForwarder)this.cellEvent).addCellEvent(cellEvent);
else {
PdfPCellEventForwarder forward = new PdfPCellEventForwarder();
forward.addCellEvent(this.cellEvent);
forward.addCellEvent(cellEvent);
this.cellEvent = forward;
}
}