code: protected void defaultNew() {
  
          CmsUUID referenceId = m_editableData.getStructureId();
          CmsCreateModeSelectionDialog.showDialog(referenceId, new AsyncCallback<String>() {
  
              public void onFailure(Throwable caught) {
                  // is never called
              }
  
              public void onSuccess(String result) {
  
                  openEditDialog(true, result, null);
                  removeHighlighting();
              }
          });
      }
docs: Handles the 'default case' when using the new function on an editable element.<p>