JavaScript Code
Taken from /Scripts/KendoUiExt.OkCancelDialog.js
        
var selectIcon = $("#selectIcon")
    .kendoDropDownList()
    .data("kendoDropDownList");

$.when(kendo.ui.ExtOkCancelDialog.show({ 
    title: "OK/Cancel", 
    message: "This is a sample ok/cancel box",
    icon: selectIcon.value() })
).done(function (response) {
    $("#userResponse").append(
        kendo.format("<div>{0} button clicked at: {1}</div>", 
            response.button, 
            new Date().toLocaleTimeString())
    );
});