public ChartPen Arrow {get; set;}
Remarks
The Arrow property determines the kind of pen used to draw a line connecting the Point Mark to the corresponding Series point.
Each Series class handles Marks in a different manner, thus the Arrow coordinates are specific to each Series type.
By default, Arrow pen is defined to be a White solid pen of 1 pixel width.
Example
[C#]
tChart1[0].Marks.Arrow.Visible = false;
See Also
SeriesMarks Class | SeriesMarks Members | Steema.TeeChart.Styles Namespace