code: public void setOnSelect(String onselect)
      {
          AbstractHtmlState tsh = getState();
          tsh.registerAttribute(AbstractHtmlState.ATTR_JAVASCRIPT, ONSELECT, onselect);
      }
docs: Sets the onSelect javascript event.
  @param onselect the onSelect event.
  @jsptagref.attributedescription The onSelect JavaScript event.
  @jsptagref.databindable false
  @jsptagref.attributesyntaxvalue <i>string_onSelect</i>
  @netui:attribute required="false" rtexprvalue="true"
  description="Sets the onSelect javascript event."