code: protected void showMenu(final CmsSitemapHoverbar hoverbar) {
  
          // lock the hoverbar visibility to avoid hide on mouse out
          hoverbar.setLocked(true);
          hoverbar.loadEntry(new AsyncCallback<CmsClientSitemapEntry>() {
  
              public void onFailure(Throwable caught) {
  
                  // TODO Auto-generated method stub
  
              }
  
              public void onSuccess(CmsClientSitemapEntry result) {
  
                  setMenuVisible(hoverbar);
              }
          });
      }
docs: Shows the context menu.<p>
  
  @param hoverbar the hoverbar instance