SceneGraphObjectHolder animHolder=Universe.findHolder(_p.getHolder(), _anim);
if(animHolder==null){
throw new RuntimeException("Invalid Animator");
}
animHolder.removeSceneGraphObject(ref, null);
RemoveEdit re=new RemoveEdit(animHolder, ref);
animHolder.getUndoableEditListener().undoableEditHappened(
new UndoableEditEvent(this, re));
}