code: protected boolean hasNestedContainers() {
  
          boolean hasNestedContainers = false;
          for (CmsContainer container : m_containers.values()) {
              if (container.getParentContainerName() != null) {
                  hasNestedContainers = true;
                  break;
              }
          }
          return hasNestedContainers;
      }
docs: Checks if any of the containers are nested containers.<p>
  
  @return true if there are nested containers