How to: Create Alternating Row Colors on a Report
By default, Access formats each row of a report's detail section with the same background color. When printing a report, shading every other line of the detail section can make it much easier to read. You can use the AlternateBackColor property to specify a color to be displayed or printed on every other line in the detail section when viewing or printing a report.
The following example illustrates how to display light gray bars on every other line of the report's detail section when it is printed.
Private Sub Detail_Print(Cancel As Integer, PrintCount As Integer)
Me.Section("Detail").AlternateBackColor = RGB(240, 240, 240)
End Sub