THISBACK2 doesn't seem to work (v610) - at least in this context.
Sorry about that, that variant really is not part of U++ (yet?)
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Despite this working for me now and most smaller applications wouldn't read their interfaces from a file at runtime anyways, I think it might be worth it to allow for a more "procedural" approach of menu creation for such situations - I haven't investigated the needed changes, so it could be too much work for the benifit.
Well, the needed changes are exactly what you have done now. I think that callback based menu should be primary, because it is more generic - you can quite easily implement non-callback menu using callback variant, but opposite is not true.