docs: private IndexedContainer createContainer() throws IOException, CmsException {
  
          IndexedContainer container = null;
  
          if (m_bundleType.equals(CmsMessageBundleEditorTypes.BundleType.DESCRIPTOR)) {
              container = createContainerForDescriptorEditing();
          } else {
              if (hasDescriptor()) {
                  container = createContainerForBundleWithDescriptor();
              } else {
                  container = createContainerForBundleWithoutDescriptor();
              }
          }
          container.setItemSorter(new DefaultItemSorter(CmsCaseInsensitiveStringComparator.getInstance()));
          return container;
      }