[Urwid] ListBox selected item not displayed

[John Powell]

Hey Guys,
 
I hope you can give me a clue as to what I am doing wrong here. I have
attached a small example that demonstrates my problem. While moving through
elements in the listbox I do not see the text foreground and background
change as I expect it should. I must be missing something obvious.
 
Thanks in advance,
 
./John
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