KB10336 - How can I make a polygon layer completely transparent except for the polygon outlines, which I want to remain visible? The DK transparency property seems to apply to the layer as a whole, i.e., both the polygon fills and outlines. I need a background aerial photo to show through completely, but I also want the polygon outlines to appear sharp and bold.

Yes, you can make the polygon fills transparent, leaving the polygon outlines visible. Attach the same layer two times.

First: Area.OutlineWidth = 0
(Results in transparent outline.)

Second Area.OutlineWidth = a value greater than 0. Area.Pattern = Transparent
(Results in transparent fill but visible polygon outlines.)