grAxis objects in Graph controls
A drop line is a line that extends from a data point to its axis. Drop lines are not available for all graph types.
To set the drop line type:
Display the Axis tab page of the graph control’s Properties view.
Select the desired Axis from the Axis drop-down list.
Select the type of line desired from the DropLines drop-down list.
The DropLines property takes a value of the LineStyle enumerated datatype.
The following example sets dashed lines for the drop lines in the Series axis:
gr_1.Series.DropLines = Dash!
