private void refreshWorkspaceList() {
   LoadingPopup.showMessage(constants.LoadingWorkspaces());
   repositoryService.listWorkspaces(
       new GenericCallback<String[]>() {
         public void onSuccess(String[] workspaces) {
           availableWorkspacesListBox.clear();
           for (String workspace : workspaces) {
             availableWorkspacesListBox.addItem(workspace);
           }
           LoadingPopup.close();
         }
       });
 }