how to get the invidual shapes from the stencil

[praveenkumar]

Hi,
I created one stencil in visio with three shapes(line,circle and a box).I
want to assign a special property to the box.When ever a new shape is placed
on the box i want to replace the box with the new object.For that first i
want to seperate it from the stencil.How can i get the box invidually ?Please
reply me.

Thanks in advance,
Praveen