GridStyle

Declaration: ChartBook.Charts[].GridStyle: TGridStyle;
The property GridStyle determines the type of the grid:

gsNone No grid is displayed
gsPoints The grid is indicated by points
gsVertLines Vertical grid lines
gsHorizLines Horizontal grid lines
gsLines Both vertical and horizontal grid lines
gsHorizDotLines Only horizontal, dotted grid lines will be displayed
gsVertDotLines Only vertical, dotted grid lines will be displayed
gsDotLines Both vertical and horizontal grid lines are displayed as dotted lines.

Hint: Grid lines are rather costly as far as processing time is concerned. Thus you should be careful to avoid too many grid lines if rendering speed is of any essence.