When you move a shape or create a shape completely within another Shape, ShapeDesigner™ actually creates a hole the same size as the contained shape and places the shape within this hole. The new composite section is treated as a whole when comes the time to move or delete the containing shape.
It is possible to manipulate a drawing such that one or more shapes overlap (i.e. they are not completely in or out of another shape) . This situation must be fixed before computations may begin. If you try to perform computations in this state, you will get an error message similar to this: