final PTabLayoutPanel tabPanel = new PTabLayoutPanel();
tabPanel.setSizeFull();
tabPanel.setAnimationVertical(false);
tabPanel.setAnimationDuration(1000);
tabPanel.addBeforeSelectionHandler(new PBeforeSelectionHandler<Integer>() {
@Override
public void onBeforeSelection(final PBeforeSelectionEvent<Integer> event) {
PNotificationManager.showTrayNotification("onBeforeSelection, tab index : " + event.getSelectedItem());
}