docs: public Map<String, List<CmsJspResourceWrapper>> getElementsInContainer() {
  
          return CmsCollectionsGenericWrapper.createLazyMap(obj -> {
              if (obj instanceof String) {
                  List<CmsJspResourceWrapper> elements = new ArrayList<>();
                  CmsContainerBean container = getPage().getContainers().get(obj);
                  if (container != null) {
                      for (CmsContainerElementBean element : container.getElements()) {
                          try {
                              element.initResource(m_cms);
                              elements.add(CmsJspResourceWrapper.wrap(m_cms, element.getResource()));
                          } catch (Exception e) {
                              LOG.error(e.getLocalizedMessage(), e);
                          }
                      }
                  }
                  return elements;
              } else {
                  return null;
              }
          });
  
      }