Labels in 3D WinForms-Barchart are not shown if all y-values are 0

is there any possibility to show datapoint-labels in 3D-Barcharts even if the value of all DataPoints is 0? Adding a single DataPoint that has a Y-Value > 0 forces all points to show their labels but what if I just have no y-values? This works for 2D charts but not in 3D.

My code is

    private String[] _captions = new string[]
    {
        "aaaaaaaaaaaaaaaaaaaaaa",
        "aaaaaaaaaaaaaaaaaaa",
        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
        "aaa aaa a aaa a a aaaaaaaaaaaaaaa aaaaa",
        "aaaaaaaaaaaaaaaaaaaaa"
    };

    public Form1()
    {
        InitializeComponent();
        chart1.Series.Clear();

        // Ensure that chart is shown 3D (the labels are always shown in 2D)
        chart1.ChartAreas[0].Area3DStyle.Enable3D = true;

        Series series = new Series();
        series.ChartType = SeriesChartType.Bar;

        // I want every value to be displayed
        chart1.ChartAreas[0].AxisX.Interval = 1;

        // Fill the series
        DataPoint dp;
        for (int i = 0; i < 20; i++)
        {
            dp = new DataPoint(i, 0);
            dp.AxisLabel = _captions[i % _captions.Length];
            dp.IsValueShownAsLabel = true;
            series.Points.Add(dp);
        }

        // Add the series
        chart1.Series.Add(series);
    }

Best regards!