controlgroup events

controlgroup events

I have a select with several options. The onchange event doesn't work for this. Is there a way around this? Any select I have that is not in a controlgroup works fine. The events for the radio buttons that are in a control group work as expected also.
  1. <fieldset>
        <legend>Certificate of Service</legend>
        <div id="controlgroup1">
            <select id="servicextype">
                <option value='none'>None</option>
                <option value='hand'>Hand</option>
                <option value='usps'>USPS</option>
                <option value='fax'>FAX</option>
                <option value='email'>EMAIL</option>
            </select>
            <label for="def-counsel">Def. Counsel</label>
            <input type="radio" name="served" id="def-counsel">
            <label for="defendant">Defendant</label>
            <input type="radio" name="served" id="defendant">       
        </div>
    </fieldset>