Value

Meaning

True

If the hObject parameter specifies a container, only the objects in the container will be inserted into the new container. In this case, the container specified in hObject is destroyed.

False

If the hObject parameter specifies a container, the container and all objects within the container (objects and other containers) will be inserted into the new container.
If the hObject parameter specifies an object, that object will be inserted into the new container.