docs: private void setUpSharedFolderComboBox() {
  
          m_fieldSharedFolder.setNullSelectionAllowed(false);
          m_fieldSharedFolder.setTextInputAllowed(false);
          try {
              List<CmsResource> folderUnderRoot = m_cms.readResources("/", CmsResourceFilter.DEFAULT_FOLDERS, false);
              for (CmsResource folder : folderUnderRoot) {
                  if (!m_forbiddenFolder.contains(folder.getRootPath())) {
                      m_fieldSharedFolder.addItem(folder.getRootPath().replace("/", ""));
                  }
              }
          } catch (CmsException e) {
              LOG.error("Error reading resource.", e);
          }
      }