final PListBox operation = new PListBox(true);
operation.addItem("Select \"Friesian horse\"", 0);
operation.addItem("Get textbox value", 1);
operation.addItem("Enable/Disable textbox", 2);
operation.addItem("Clear", 3);
operation.addItem("Add items", 4);
operation.addChangeHandler(new PChangeHandler() {
@Override
public void onChange(final PChangeEvent event) {
final Integer item = (Integer) operation.getSelectedValue();