Sent when an accessibility client requests the number of
children in the control.
<p>
Return the number of child items in the <code>detail</code>
field of the event object.
</p>
@param e an event object containing the following fields:<ul>
<li>detail OUT - the number of child items in this control</li>
</ul>
Sent when an accessibility client requests the number of children in the control. <p> Return the number of child items in the <code>detail</code> field of the event object. </p>
@param e an event object containing the following fields:<ul> <li>detail OUT - the number of child items in this control</li> </ul>