code: protected void setMenuVisible(final CmsSitemapHoverbar hoverbar) {
  
          updateVisibility();
          CmsContextMenu menu = new CmsContextMenu(new ArrayList<I_CmsContextMenuEntry>(m_entries), false, getPopup());
          m_menuPanel.setWidget(0, 0, menu);
          // add the close handler for the menu
          getPopup().addCloseHandler(new CmsContextMenuCloseHandler(menu));
          getPopup().addCloseHandler(new CloseHandler<PopupPanel>() {
  
              public void onClose(CloseEvent<PopupPanel> closeEvent) {
  
                  onMenuClose(hoverbar);
                  closeMenu();
              }
          });
          openMenu();
      }
docs: Sets the context menu visible.<p>
  
  @param hoverbar the hoverbar instance