I have now successfully got the new UI themes working - thanks to everyone 
for their advice.

Looking through the code I see quite a few classes which are defined like 
this:

TEasilyThemed classTrait
        uses: {}

This raises a few questions for me

1. As there is no subclass message it seems to imply that TEasilyThemed is 
at the same level as Object.  Is that right? because I thought that all 
objects were actually subclasses of Object

2. What does uses: mean?  I haven't seen this in a class definition 
before.

Thanks
AB
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