code: private Component createConvertToPropertyBundleButton() {
  
          Button addDescriptorButton = CmsToolBar.createButton(
              FontOpenCms.SETTINGS,
              m_messages.key(Messages.GUI_CONVERT_TO_PROPERTY_BUNDLE_0));
  
          addDescriptorButton.setDisableOnClick(true);
  
          addDescriptorButton.addClickListener(new ClickListener() {
  
              private static final long serialVersionUID = 1L;
  
              public void buttonClick(ClickEvent event) {
  
                  try {
                      m_model.saveAsPropertyBundle();
                      Notification.show("Conversion successful.");
                  } catch (CmsException | IOException e) {
                      CmsVaadinUtils.showAlert("Conversion failed", e.getLocalizedMessage(), null);
                  }
              }
          });
          addDescriptorButton.setDisableOnClick(true);
          return addDescriptorButton;
      }
docs: Creates the button for converting an XML bundle in a property bundle.
  @return the created button.