ColumnText.showTextAligned(cb, LwgElement.ALIGN_LEFT, p2, 50, 550, 0);
cb.endLayer();
cb.beginLayer(l3);
ColumnText.showTextAligned(cb, LwgElement.ALIGN_LEFT, p3, 50, 500, 0);
cb.endLayer();
PdfOCProperties p = writer.getOCProperties();
PdfArray order = new PdfArray();
order.add(l1.getRef());
PdfArray group = new PdfArray();
group.add(new PdfString("A group of two", PdfObject.TEXT_UNICODE));
group.add(l2.getRef());
group.add(l3.getRef());
order.add(group);
PdfDictionary d = new PdfDictionary();
d.put(PdfName.ORDER, order);
p.put(PdfName.D, d);
} catch (DocumentException de) {
System.err.println(de.getMessage());
} catch (IOException ioe) {
System.err.println(ioe.getMessage());
}