Close

<input id="datepicker" />
<script>
$("#datepicker").kendoDatePicker({
    close: function(e) {
        e.preventDefault(); //prevent popup closing
    }
});
</script>

<input id="datepicker" />
<script>
$("#datepicker").kendoDatePicker();

var datepicker = $("#datepicker").data("kendoDatePicker");

datepicker.bind("close", function(e) {
    e.preventDefault(); //prevent popup closing
});
</script>