Show

<button id="splitbutton" type="button">Button</button>
<script>
    $("#splitbutton").kendoSplitButton({
        items:[
            { id: "item1", text: "Item 1", hidden: true },
            { id: "item2", text: "Item 2" }
        ]
    });
    var button = $("#splitbutton").data("kendoSplitButton");

    button.show($("#item1"));
</script>