Use the GridLineColor property to specify the color for the vertical grid lines between time units. Use the DrawGridLines property to specify whether the control draws the grid lines in the chart's area. The DrawGridLines property draws the vertical grid lines only if the DrawGridLines property of the Chart object is exVLines, exRowLines or exAllLines. If the DrawGridLines property is exNoLines, exHLines, the DrawGridLines property has no effect. Use the MarkTodayColor property to specify the color to mark the today date.