[Urwid] Keys and focus handling

[Fabian Braennstroem]

Dear urwid users,

I am starting to take a look at urwid after a quite long brake again... 
so I am still a newbie :-)

I am a bit confused about the handling of button-press reactions and 
setting focus using keys for different widgets. I attached a small 
example. The aim is to show a help text or some more buttons on the 
right green 'box' in the inner-frame as soon as I walk through the 
buttons. The focused is set to the buttons, but as soon as I press one 
of the buttons I would like to focus to the current content of the right 
green column.
It would be nice, if anyone has a hint, how to achieve this!?

Thanks!
Fabian
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