Spreadsheet issues

I am also trying to put Kendo spreadsheet UI in kendo window UI ..then it is also giving same error i.e _grid is undefined or null.

here is code . please help.

@(Html.Kendo().Window().Name("Window")
    .Modal(false)
    .Resizable().Visible(false).Height(450).Width(1120)
    .Title("Window")
    .Content(
        Html.Kendo().Spreadsheet()
                    .Name("spreadsheet3")
                   .HtmlAttributes(new { style = "width:100%; margin-top:5px;" })
         .ToHtmlString()
         )
    ).Render();