ondblclick is not working in calendar control?

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ASP.NET

C#5.0

I have one calendar control in my webform ondblclick of datecell modalpopup should open...how to do this???


i have tried something in javascript am i correct???if not where am i wrong...


javascript::

<script type="text/javascript">
    window.onload = function () {
        var timer;
        var el = document.getElementById('Calendar1');
        el.onclick = function () {
            if (timer) clearTimeout(timer);
            timer = setTimeout(function () { alert('<%= Calendar1.SelectedDate.Date.ToLongDateString() %>'); }, 250);
            document.getElementById("GridView1").style.display = 'block';
        }
        ondblclick = function Cal1() {
            clearTimeout(timer);
            alert('<%= Calendar1.SelectedDate.Date.ToLongDateString() %>'+"DoubleClick");
            document.getElementById("Mdl1").style.display = 'block';
        }
    }
</script>