code: private void animateShow() {
  
          // ensure to display the notification above everything else
          Element parent = getElement().getParentElement();
          if (parent != null) {
              parent.getStyle().setZIndex(I_CmsLayoutBundle.INSTANCE.constants().css().zIndexDND());
          }
          getElement().getStyle().clearVisibility();
          m_animation = CmsFadeAnimation.fadeIn(getElement(), new Command() {
  
              /**
               * @see com.google.gwt.user.client.Command#execute()
               */
              public void execute() {
  
                  onShowComplete();
              }
          }, 200);
      }
docs: Animates showing the messages.<p>