refresh

The refresh() method reloads the current instance of the DropDown widget.
The optional parameter options gives the possibility to extend the initial options with the new ones.

<select id="ddl"></select>

<script type="text/javascript">
    $(function () {
        $("#ddl").shieldDropDown({
            dataSource: {
                data: countries
            },
            enabled: false,
            textTemplate: "{name}",
            valueTemplate: "{code}"
        });

        $("#ddl").swidget().refresh();

    });
</script>