How to add template control in menu items?

Set TemplateID property of the MenuItem to the id of the TemplateControl.

C#

< cc1:MenuItem TemplateID="TmpCalendar" Text="Calendar">

< Templates>

< cc1:TemplateControl ID="TmpCalendar">

< Template>

< asp:Calendar id="Calendar1" runat="server">< /asp:Calendar>

< /Template>

< /cc1:TemplateControl>

< /Templates>