[Papervision3D] Compositing index-sorted and z-sorted things

[Jeremy Sachs]

I've got a DO3D called "a" that uses index sorting inside another DO3D  
called "b" that uses z-sorting. For some reason, DO3D-a keeps drawing  
all its layers on top of the other objects in DO3D-b. Is this typical?  
And if so, how do I mix index-sorted objects with z-sorted ones?

-Jeremy S.