Including subobjects settings as separate settings

[Anonymous]

Hi there,
I would like to include a separated settings dialog for the objects instantiated by the Layout class.

as a Reference the Grid Assistant has a checkbox and a settings button for each object that it instantiates.

Is it possible to define an object as an object's Parameter ?

For example, in the case of a Table layout, the Table, and the Chairs, should be defined as parameters in the Layout object. The Layout object settings, should only define, layouting parameters, while the Chair object settings should define its size and material definitions.