Labels should render above Polygons and Polylines regardless of order added

[djone010]

No matter what altitude I put my label at, it always gets rendered beneath a polygon or polyline when the primitive is added after the labelcollection. To see what I mean, try In the Sandbox to paste the label code example into the polygon example and move the label's position so it intersects with the polygon.

I can use sendtoback in compositeprimitive to keep the ordering correct, but I was just thinking that maybe this should be done always in the compositeprimitive class without my intervention.

[drakej]

This would be nice although any form of draw ordering control is welcome.

[hpinkos]

duplicate of #4108