code: @Override
      protected void onEnsureDebugId(String baseID) {
          super.onEnsureDebugId(baseID);
          ensureDebugId(labelElem, baseID, "label");
          ensureDebugId(inputElem, baseID, "input");
          labelElem.setHtmlFor(inputElem.getId());
      }
docs: <b>Affected Elements:</b>
  <ul>
  <li>-label = label next to checkbox.</li>
  </ul>
  
  @see UIObject#onEnsureDebugId(String)