GridStyle

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	Horizontal dotted grid lines
gsVertDotLines	Vertical dotted grid lines
gsDotLines	Both vertical and horizontal dotted grid 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 the drawing speed of the chart is crucial.

Example:

This property is used in the following example program (see http://www.lohninger.com/examples.html for downloading the code): duallayer