P3D v4 [XML] Polygon with transparency?

It looks like there's no <transparency> tag for polygons. Is there a workaround for this shortcoming?
Meh. Prepar3d/FSX really don't like transparency, hu? I tried using a rectangle instead, since that can have transparency set. Buuut, if I add a <Rotation> object to the element, the rectangle won't show up. :tongue-ti
...I take it you don't use these functions, hu? :laughing:
It's OK, I go with simple, ugly squares then.