By default, the GridLineStyle property is exGridLinesDot. The GridLineStyle property has effect only if the chart's DrawGridLines property is not zero. Use the DrawGridLines property of the Level object to show the vertical grid lines for the specified level. Use the GridLineColor property of the Level object to specify the color for vertical grid lines in the chart area. Use the GridLineStyle property of the Level object to specify the style for vertical grid lines in the chart area.  Use the GridLineColor property to specify the color for grid lines. Use the DrawGridLines property to specify whether the control draws the grid lines in the items area. Use the DrawLevelSeperator property to draw lines between levels inside the chart's header. Use the DrawTickLines property to specify whether the grid lines between time units in the level are visible or hidden. Use the MarkTodayColor property to specify the color to mark the today date.