Why Rich:toolTip not work Under rich:calendar

Why is Rich:toolTip not working under rich:calendar?

<td> 
<rich:calendar id="valuereq" requiredMessage="R开发者_高级运维equested Date Required" inputClass="inside_text" value="#{projectDetailManageBean.projectDetail.requestDate}"    datePattern="M/dd/yy" required="true">
<rich:toolTip for="valuereq">Select Request    Date</rich:toolTip>
</rich:calendar> 
</td>

This code should display a tooltip on the calendar box, but it didn't show .. why so?

---

This looks like jboss RichFaces. And there is one open issue with rich:toolTip inside a rich:calendar. Check your code if it qualifies for this bug.