I have following markup

@Html.Kendo().RadioGroupFor(m => m.UserType).LabelPosition(RadioGroupLabelPosition.After).Layout(RadioGroupLayout.Vertical).Items(item =>
         {
             item.Add().Label("Test1").Value("Test1");
             item.Add().Label("Test2").Value("Test2");
             item.Add().Label("Test3").Value("Test3");
         })
@Html.ValidationMessageFor(m => m.UserType, "", new { @class = "text-danger" })

The above code shows required validation for UserType from server side properly. ( UserType variable decorted with Required )

However from client side it does NOT.  Unfortunately I cannot use   (form).KendoValidator()