>     'requested': {
>                'invisible': And(Bool(~Eval('requesting'))
>                                  , (Eval('state') == 'free')
>                                   ),
>                     },
>
> 'invisible' means just that. From what is written here, the button  will
be invisible when
'state' is 'free' and 'requesting' is checked.

What you want should be something like :
'invisible': Not(And(~~Eval('requesting), Eval('state') == 'free'))

Jean CAVALLO
Coopengo

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