Tree layout for children widgets inside a parent widget

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Hi,

I am using the Visual Library in a NB Platform app to create a scene
with a bunch of  'container' widgets, that in turn contain an heirarchy
of children widgets.  I add the children widgets to the container
widget and not to the scene.  I use TreeGraphLayout to layout the
containers.  Is it possible to apply TreeGraphLayout in some way to the
children inside the container widget?  I noticed that
TreeGraphLayout.performNodesLayout throws an
UnsupportedOperationException.  Is this method perhaps what I am
looking for, but not yet implemented?

Example hieriarchy:

a topWidget
a number of containerWidgets
an heirarchy of children inside a container widget, e.g.:
containerWidget.addChild(level1)
containerWidget.addChild(level2_a)
containerWidget.addChild(level2_b)

with connections:

top -> container1 -> level1 -> level2_a
                                                -> level2_b
       -> container2 -> ...

I would really appreciate it if someone could point me in the right
direction!

Regards,
Ilana