code: public void setDeselectAllText(final String deselectAllText) {
          if (deselectAllText != null)
              attrMixin.setAttribute(DESELECT_ALL_TEXT, deselectAllText);
          else
              attrMixin.removeAttribute(DESELECT_ALL_TEXT);
      }
docs: The text on the button that deselects all options when
  <b>actionsBox</> is enabled.<br>
  <br>
  Defaults to <code>Deselect All</code>.
  
  @param deselectAllText