Kendo MVC图表-如何在加载数据时显示动画？

@(Html.Kendo().Chart()
    .Name("chart")
    .Title("Sales Report")
    .DataSource(ds => ds.Read(read => read.Action("GetData", "Chart")))
    .Series(series =>
    {
        series.Column(model => model.Sales).Name("Sales");
    })
    .CategoryAxis(axis => axis
        .Categories(model => model.Month)
        .MajorGridLines(lines => lines.Visible(false))
    )
    .ValueAxis(axis => axis
        .Numeric()
        .MajorGridLines(lines => lines.Visible(true))
    )
    .Tooltip(tooltip => tooltip
        .Visible(true)
        .Format("{0}"))
    .ChartArea(area => area
        .Background("transparent")
    )
    .Loading(loading => loading
        .Show(true)
        .BackgroundColor("transparent")
        .Indicator(new ChartLoadingIndicator
        {
            Background = "transparent",
            Size = 60,
            Type = ChartLoadingIndicatorType.Pie
        })
    )
)