@(Html.Kendo().ToolBar()
            .Name("ToolBar")
            .Items(items =>
            {
                items.Add().Type(CommandType.SplitButton).Text("Split Button").Id("splitBtn")
                .MenuButtons(menuButtons =>
                {
                    menuButtons.Add().Text("Action 1").Id("splitBtn_action1");
                    menuButtons.Add().Text("Action 2").Id("splitBtn_action2");
                    menuButtons.Add().Text("Action 3").Id("splitBtn_action3");
                });
                items.Add().Type(CommandType.Separator);
                items.Add().Type(CommandType.Button).Text("Overflow button").Id("overflowButton").Overflow(ShowInOverflowPopup.Always);
            })
            .Events(e => e.Click("onClick"))
)

<script>
    function onClick(e) {
        var targetElement = e.target;
        var targetElementId = e.id;
    }
</script>

<script>
$(document).ready(function(){
    $("[data-role='contextmenu'] li[id^='splitBtn'], [data-role='buttonmenu'] li[id^='splitBtn']").on("click", function(){
        console.log($(this).attr("id"));
    });
})
</script>