Button inside moviemateriel in papervision

programming flash
1 
var mam:MovieMaterial = new MovieMaterial(new **clip**);
mam.interactive = true;
mam.smooth = true;
mam.animated = false;
//mam.doubleSided = true;
var **plano** = new Plane(mam, 300,200, 2, 2);

How I put action in a button inside the movieclip (CLIP) named BT1

Thanks and sorry for my english