ActionScript 3.0 :: Away3d AbstractPrimitive Is Wrapping Faces In Bitmap Rather Than Itself

I'm working in Away3d and have hit a road block.I'm creating an abstract primitive (that looks like a pentagon) made from 5 faces, each of which is determined by dynamically generated vertices. I can't just use the regular polygon class because the placement of the object has to be exact.

Here's the issue:I need to 'cover' the abstract primitive in a bitmap.So all five faces need to be covered in one bitmap.But my code (below) results in each face getting covered by its own bitmap.So instead of looking like a pentagon covered with the image, you can see each face individually covered by a different copy of the bitmap.

var ap:AbstractPrimitive = new AbstractPrimitive();
var bmm:BitmapMaterial = new BitmapMaterial(Cast.bitmap("roundDoor"));
ap.bothsides = true; [code]....