Interface based stereotype: child diagr, not below

[Thomas H.]

I created a stereotype "MyIF-Stereotype" that extends the metaclass "Interface" and added the following attributes to the metaclass:

 _defaultDiagramType string = UML Structural::Class
  _makeComposite      boolean = true

When I use the new profile to create an element with my stereotype "MyIF-Stereotype" the child class diagram is created at the same level where the new element is created.

I would expect that the automatically created child class diagram is placed below a newly created element?