code: public void displayNewModelPage(CmsModelPageEntry modelPageData, boolean isModelGroup) {
  
          CmsModelPageTreeItem treeItem = new CmsModelPageTreeItem(modelPageData, isModelGroup, false);
          CmsSitemapHoverbar.installOn(
              m_controller,
              treeItem,
              modelPageData.getStructureId(),
              modelPageData.getSitePath(),
              modelPageData.getSitePath() != null);
          m_modelPageTreeItems.put(modelPageData.getStructureId(), treeItem);
          if (isModelGroup) {
              m_modelGroupRoot.addChild(treeItem);
          } else {
              m_modelPageRoot.addChild(treeItem);
          }
      }
docs: Adds a new model page to the model page view.<p>
  
  @param modelPageData the data for the new model page
  @param isModelGroup in case of a model group page