overlayUnder

Place the overlay text 'under' other drawn objects.
[read-only property] overlayUnder([out, retval] LONG *flag)
Draw the overlay text first so that it appears "under" other drawn objects on the page (a so-called watermark). The exact behavior will depend on the nature of the PDF file: for example, a PDF file that starts by drawing a large, white, filled rectangle over the entire page will cover up any overlays drawn with this flag.

This property is only useful as an argument to the addOverlayText function.

VB6:
pdf.addOverlayText "CONFIDENTIAL", "Arial", 1, 0, "Helvetica-Bold", _ RGB(0, 0, 0), 10, 200, 50, 0, pdf.overlayUnder
addOverlayText