code: @Nullable
    public final String getHiddenFieldName ()
    {
      final String sFieldName = getName ();
      if (StringHelper.hasNoText (sFieldName))
        return null;
  
      return HIDDEN_FIELD_PREFIX + sFieldName;
    }
docs: Get the hidden field name for this checkbox.
  
  @return <code>null</code> if no field name ({@link #getName()}) is present
  or a non-<code>null</code> and non-empty string.