l3.setOn(false);
ArrayList radio = new ArrayList();
radio.add(l1);
radio.add(l2);
radio.add(l3);
writer.addOCGRadioGroup(radio);
LwgPhrase p1 = new LwgPhrase("Text in layer 1");
LwgPhrase p2 = new LwgPhrase("Text in layer 2");
LwgPhrase p3 = new LwgPhrase("Text in layer 3");
LwgPhrase p4 = new LwgPhrase("Text in layer 4");
cb.beginLayer(l1);