Render a Dialog without header

<div id="container" style="height:400px;">
    @Html.EJS().Button("targetButton").Content("Open Dialog").Render()
    @Html.EJS().Dialog("dialog").Content("This is a dialog without header.").Target("#container").Width("250px").Buttons(btn=> {
    btn.Click("dlgButtonClick").ButtonModel(ViewBag.DialogButtons1).Add();
    btn.Click("dlgButtonClick").ButtonModel(ViewBag.DialogButtons2).Add();
}).Render()
</div>
<script>
    document.getElementById('targetButton').onclick = function () {
        var dialog = document.getElementById("dialog").ej2_instances[0];
        dialog.show();
    }
    function dlgButtonClick() {
        var dialogObj = document.getElementById('dialog').ej2_instances[0];
        dialogObj.hide();
    }
</script>

public class HomeController : Controller
{

    public class ButtonModel
    {
        public string content { get; set; }
        public bool isPrimary { get; set; }
        public string cssClass { get; set; }

    }

    public ActionResult Index()
    {
        ViewBag.DialogButtons1 = new ButtonModel() { isPrimary = true, cssClass = "e-flat", content = "OK" };
        ViewBag.DialogButtons2 = new ButtonModel() { content = "Cancel", cssClass = "e-flat" };
        return View();
    }

}