HoverMenu: trigger onShow and onHide events for jquery script

Dear all,

I have a ajaxToolkit:HoverMenuExtender that shows/hide a panel:

<ajaxToolkit:HoverMenuExtender ID="HoverMenuExtender3" runat="Server" TargetControlID="imgbtnMore"
PopupControlID="pnlOtherFunctions" PopupPosition="Bottom" OffsetX="-202" OffsetY="4"
PopDelay="50" BehaviorID="behavemenumore" /><asp:Panel CssClass="popupMoreMenu MenuItem hoverPanel" ID="pnlOtherFunctions" runat="server">

I (really) need to intercept the events onShow/onHide (when the panel "pnlOtherFunctions" appears and disappear), because I want to hide/show another div in the page.
Unfortunately, every attempts to intercepts events on my panel visibility failed.

How can I easily achieve this?

My best,
MT