ActionScript 3.0 :: Add Interaction At The Cube?

i'm trying to use for the first time papervision.I'm able to add a cube to the scene. now i wanna add interaction at the cube. i try with

Code:
InteractiveScene3DEvent.OBJECT_PRESS

but it doesn't do anything.another thing that i've not understand is that if delete this instruction:

Code:
renderer.renderScene(scene, camera, viewport);

i don't see anything.This is the code:

Code:
import org.papervision3d.view.Viewport3D;
import org.papervision3d.cameras.*;
import org.papervision3d.scenes.Scene3D;

[code]...