code: protected SectionComponentFactory<CR> getSectionComponentFactory() {
          if (sectionComponentFactory == null) {
              sectionComponentFactory = createDefaultSectionComponentFactory();
          }
          sectionComponentFactory.setItemComponentFactory(getItemComponentFactory());
          return sectionComponentFactory;
      }
docs: Returns the current {@link org.vaadin.spring.sidebar.components.AbstractSideBar.SectionComponentFactory}. If no
  factory has been set, a default factory is created.
  
  @see #setSectionComponentFactory(org.vaadin.spring.sidebar.components.AbstractSideBar.SectionComponentFactory)
  @see #createDefaultSectionComponentFactory()