How to show or hide waiting popup at the time of uploading using UploadBox

<div class="frame">

        <div class="control">

            Select a file to upload

            <div class="posupload">

                @Html.EJ().Uploadbox("UploadDefault").SaveUrl("SaveDefault").Locale("en-US").RemoveUrl("RemoveDefault").ClientSideEvents(e => e.Complete("uploadComplete").Begin("fileuploadbegin"))

            </div>

            <div>

                <div id="target"></div>

                @Html.EJ().WaitingPopup("target").ShowOnInit(false)

            </div>

        </div>

    </div>

public ActionResult SaveDefault(IEnumerable<HttpPostedFileBase> UploadDefault)

         {

             foreach (var file in UploadDefault)

             {

                 var fileName = Path.GetFileName(file.FileName);

                 var destinationPath = Path.Combine(Server.MapPath("~/App_Data"), fileName);

                 file.SaveAs(destinationPath);

             }

             return Content("");

         }

         public ActionResult RemoveDefault(string[] fileNames)

         {

             foreach (var fullName in fileNames)

             {

                 var fileName = Path.GetFileName(fullName);

                 var physicalPath = Path.Combine(Server.MapPath("~/App_Data"), fileName);

                 if (System.IO.File.Exists(physicalPath))

                 {

                     System.IO.File.Delete(physicalPath);

                 }

             }

             return Content("");

         }

function uploadComplete() {

            var obj = $("#target").data("ejWaitingPopup");

            obj.hide();

}

 function fileuploadbegin() {

            var obj = $("#target").data("ejWaitingPopup");

            obj.setModel({ target: "#" + this.diaObj.wrapper[0].id, showOnInit: true });

}