Line series not being drawn

private class CustomPalette : ChartPalette
{
    public CustomPalette()
    {
        var color1 = Color.Purple;//Color.FromArgb(40, Color.Silver);
        var color2 = Color.CornflowerBlue;
        var color3 = Color.DarkBlue;
        var color4 = Color.LawnGreen;
        var color5 = Color.Red;
        var color6 = Color.Pink;
        var color7 = Color.Black;
        var color8 = Color.Orange;

        GlobalEntries.Add(color1, color1);
        GlobalEntries.Add(color2, color2);
        GlobalEntries.Add(color3, color3);
        GlobalEntries.Add(color4, color4);
        GlobalEntries.Add(color5, color5);
        GlobalEntries.Add(color6, color6);
        GlobalEntries.Add(color7, color7);
        GlobalEntries.Add(color8, color8);
    }
}