code: public void setCellEvent(PdfPCellEvent cellEvent) {
      	if (cellEvent == null)
      		this.cellEvent = null;
      	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;
      	}
      }
docs: Sets the cell event for this cell.
  
  @param cellEvent the cell event