open

Whether the drop down list is opened initially. The default value is false:

<input id="combo" ></input>

<script type="text/javascript">

    $(function () {
        $("#combo").shieldComboBox({
            dataSource: {
			    data: countries
		    },
            open: true,
		    textTemplate: "{name}",
		    valueTemplate: "{code}",
            inputTemplate: "{name}"
       });
    });

</script>