code: void handleFileTreeClick(ItemClickEvent event) {
  
          Item resourceItem = m_treeContainer.getItem(event.getItemId());
          if ((resourceItem.getItemProperty(CmsResourceTableProperty.PROPERTY_DISABLED).getValue() == null)
              || !((Boolean)resourceItem.getItemProperty(
                  CmsResourceTableProperty.PROPERTY_DISABLED).getValue()).booleanValue()) {
              // don't handle disabled item clicks
              try {
                  readFolder((CmsUUID)event.getItemId());
              } catch (CmsException e) {
                  CmsErrorDialog.showErrorDialog(
                      CmsVaadinUtils.getMessageText(Messages.ERR_EXPLORER_CAN_NOT_READ_RESOURCE_1, event.getItemId()),
                      e);
                  LOG.error(e.getLocalizedMessage(), e);
              }
          }
      }
docs: Handles the file tree click events.<p>
  
  @param event the event