By default, the ChartGridLines property has no effect until the Format property is specified and valid. The Format property specifies an expression to define the labels between grid lines. The Color property specifies the line's color. The Style property defines the style of the line. The Width property specifies the line's width or size (1 by default). The Step property defines the step to show the grid lines. The Skip property specifies the number of grid lines to skip. The OverviewGridLines property defines the configuration options to show the grid lines and labels between for the overview panel.