I don't see how to do it with the ShapeSheet so I think the best way would be to assign it to a Layer that is not visible.

Create a couple of layers and set one of them to be not visible. Then you can select the shape and assign it to that layer. To show it again, you have the choice of moving it to the visible layer or changing the attributes of the layer it is on.

__________________
Andrew Lockton
Chrysalis Design, Melbourne Australia