final Button expandAllButton = new Button();
expandAllButton.setId("expandAllButton");
expandAllButton.setClass("planner-command");
expandAllButton.setTooltiptext(_("Expand/Collapse all"));
expandAllButton.setImage("/common/img/ico_expand.png");
expandAllButton.addEventListener("onClick", new EventListener() {
@Override
public void onEvent(Event event) {
if (expandAllButton.getSclass().equals("planner-command")) {
expandAll();
expandAllButton.setSclass("planner-command clicked");