@Override
 protected void preOpen(FolderMaintenanceMultiPageEditView view) throws ClientException {
   Folder rootFolder =
       FolderElementFactory.getFolderStructure().get(0); // FIXME add more than one root folder
   FolderMaintenanceMultiPageEditViewModel model =
       getView(FolderMaintenanceMultiPageEditView.ID).getModel();
   model.setRootFolder(rootFolder);
   super.preOpen(view);
 }
 @Override
 public void openFolderMaintenanceView() {
   super.openView(FolderMaintenanceMultiPageEditView.ID);
 }