Hi,
I noticed that when Sub-Object selection is turned on, user can’t select curves.
Despite this, one can select a surface with only a single face and no additional sub objects.
It would be convenient for Sub-Objects selection to also select single span curves.
Hm, yeah… that is a tough one I think - a single face brep has three possible sub-object types - face, edges, vertices - but a curve does not have any… thinking…
-Pascal
It does work with windows selection, it is confusing 
Hm- that seems wrong, to me…
OK, so the current thinking here is, if there is no sub-object, Ctrl-Shift click should get the top level object - which was your initial point. I’ll get this on the list, thanks.
RH-80137 Sub-object selection and curves
-Pascal
You got it, thank you Pascal!