code: public List<CmsUUID> getElementIds() {
  
          if (m_elementIds == null) {
              m_elementIds = new ArrayList<CmsUUID>(m_elements.size());
              for (CmsContainerElementBean element : m_elements) {
                  m_elementIds.add(element.getId());
              }
          }
          return m_elementIds;
      }
docs: Returns the id's of all elements in this container.<p>
  
  @return the id's of all elements in this container