In SAS graphs, what's that thing to control which elements appear on top of which other elements?

There’s some way in SAS software to force various elements in a graph to get drawn in the order you want, so for example a fine line appears in front of the cloud of big dots rather than hidden behind it. I know the choices are “A” and “B” because I think of them as meaning either “above” and “below” or meaning “after” and “before”. But I’ll be damned if I can remember what the option or statement or whatever actually is! I hunted through the docs for the symbol statement and the plot statement in gplot, but didn’t spot anything.

Any aces out there who can set me right?

P.S. I know there are fora just for SAS but I can’t remember where those are, either…