private void buildHeader() {
   header = new VerticalLayout();
   header.setHeightUndefined();
   addLangButtons();
   addNavButtons();
   addNavigation();
   addBanner();
   addComponent(header);
 }
  private void addBanner() {
    Panel bannerPanel = new Panel();
    bannerPanel.setHeight(Global.APP_BANNER_HEIGHT);
    bannerPanel.setStyleName(BANNERPANEL.toString());

    VerticalLayout banner = new VerticalLayout();
    banner.addComponent(bannerPanel);
    banner.setHeightUndefined();

    header.addComponent(banner);
    header.setComponentAlignment(banner, Alignment.TOP_CENTER);
  }