[Chimera-users] showing shapes in only selected Chimera animation scenes

Chimera users, I am making an animation that needs to include either a box generated with an opened .bild file using a .box command or a rectangle generated by "shape rectangle” I wish the box or rectangle to appear in some scenes but not in others. My problem is, if I choose to show the box or rectangle in the first scene then it is shown in all subsequent scenes even if they were created in which the box or rectangle were not shown. Any suggestions on how to show the box or rectangle in only selected scenes of the animation. Thanks Mike Oldham Rockefeller University