Solving Calendar Extender Problem in Modal Popup Extender Asp.net

Calendar Extender control when placed inside modal popup extender will not be seen in front. To solve this issue, we have the following solution

<cc1:CalendarExtender ID="CalendarExtender1" TargetControlID="Textbox1"
 PopupPosition="Right" runat="server" <strong>OnClientShown="CalendarShown"></strong> </cc1:CalendarExtender>
<pre>

function calendarShown(sender, args)
    {
        sender._popupBehavior._element.style.zIndex = 10005;
    }