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.
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!
To set the drop line type: