Viewer.GridVisible Property (Visio Viewer)
Gets or sets a value that indicates whether the page grid is visible in Microsoft Visio Viewer. Read/write.
_expression_An expression that returns a Viewer object.
You can display the grid only when the page is visible (that is, when the PageVisible property is set to True, its default setting).
The following code shows how to display the grid in Visio Viewer.
vsoViewer.GridVisible = True