Thanks goes to Karan from asp.net blogs.
<asp:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="tbTarget1"
PopupButtonID="btnCalendar" CssClass="calendarposition" OnClientShowing="currentdateactive">
</asp:CalendarExtender>
function currentdateactive(e) {
if (!e.get_selectedDate() || !e.get_element().value)
e._selectedDate = (new Date()).getDateOnly();
}
.ajax__calendar_active{background-color:#820024;color:#ffffff;border:1px solid #D4D0C8;}
/*use your own class to control positioning. careful of nested relative/absolute divs*/
.calendarposition{position:absolute;margin-top:250px;margin-left:250px;background-color:#fff;border:1px solid silver;}
/*prepend css class with div to override ms ajax web.resx autogenerated css*/
div.ajax__calendar_day{text-align:center;}
References
ASP.Net (blogs), http://weblogs.asp.net/karan/archive/2010/09/20/calendar-extender-today-s-date.aspx
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