code: public CmsUUID getId() {
  
          if (m_id != null) {
              return m_id;
          } else if (m_resource != null) {
              return m_resource.getStructureId();
          } else {
              // only in case of the default element view
              return CmsUUID.getNullUUID();
          }
      }
docs: Returns the element view id.<p>
  
  @return the group id