Shape.AddToContainers Method (Visio)
Adds the shape to all underlying containers that allow it as a member.
expression A variable that represents a 'Shape' object.
When you call the AddToContainers method, Microsoft Visio uses the setting of the ContainerProperties.ResizeAsNeeded property for each container to determine how the container resizes.
If the underlying container is a list, the shape is added as a normal container member, and not as a list member.
The AddToContainers method works only if the shape sits at least partially on top of a container that does not already contain it.