code: private String getRole(final WMenuItem item) {
  		if (!item.isSelectAllowed()) {
  			return null;
  		}
  		MenuSelectContainer selectContainer = WebUtilities.getAncestorOfClass(MenuSelectContainer.class, item);
  		if (selectContainer == null) {
  			return CHECKBOX_ROLE;
  		}
  		return MenuSelectContainer.SelectionMode.MULTIPLE.equals(selectContainer.getSelectionMode()) ? CHECKBOX_ROLE : RADIO_ROLE;
  	}
docs: The selection mode of the menu item.
  @param item the WMenuItem to test
  @return the selection mode if any