Returns a ChartLine object representing the leader lines in the pie chart.
This defaults to a ChartLine with the properties set as below, when creating a new pie series:
Visible = true,
Style = ChartLine.LineStyle.Solid,
Weight = ChartLine.LineWeight.Narrow,
Color = Color.SystemColor.AutomaticLine
This property is linked for series in the same group. See SettingsPieDoughnut for more information on how linking works.
For doughnut series, the in-code behavior is undefined, but changing the properties on this ChartLine will have no effect on the output.