final HorizontalPanel hpShow = new HorizontalPanel();
Constants constants = GWT.create(Constants.class);
hpShow.add(new ClickableLabel(constants.ShowFactTypes(),
new ClickHandler() {
public void onClick(com.google.gwt.event.dom.client.ClickEvent event) {
hpShow.setVisible(false);
hpFactsAndHide.setVisible(true);
tree.setVisible(true);