MinorTickMarks Property Example
This example turns on minor gridlines and minor tick marks for the specified axis and sets the gridline color and tick-mark style.
Set c = ChartSpace1.Constants
Set axs = ChartSpace1.Charts(0).Axes(c.chAxisPositionLeft)
axs.HasMinorGridlines = True
axs.MinorGridlines.Line.Color = "green"
axs.MinorTickMarks = c.chTickMarkOutside