A trend chart does not show horizontal or vertical grid lines.
Several configuration options control the display of grid lines. Set options for horizontal grid lines on the Y-Axis tab. Set options for vertical grid lines on the X-Axis tab.
On the Y-Axis and X-Axis tabs, verify that:
Options on the Display tab of the Trend Object Properties dialog box
Options on the X-Axis tab of the Trend Object Properties dialog box
Options on the Y-Axis tab of the Trend Object Properties dialog box
Keywords: troubleshoot, trend