Specifies that horizontal gridlines be displayed with a designated amount of space between them.
This element contains an integer value between 0 and 30 that determines the amount of space between horizontal gridlines. The default value is 1.
DisplayVerticalDrawingGridEvery, DrawingGridHorizontalOrigin, DrawingGridHorizontalSpacing, DrawingGridVerticalOrigin, DrawingGridVerticalSpacing, UseMarginsForDrawingGridOrigin
See the example in the DisplayVerticalDrawingGridEvery element topic.