Is it possible to update the <values> of a combo box on the fly? I'd  
like to update the 'position on ground' dialog to offer runways (and  
parking positions, potentially) based on the selected airport  
identifier, and I have some other uses as well. I can get the runways  
via the airportinfo() but looking at dialog.cxx, it seems that the  
update-dialog command (which maps to FGDialog::updateValues) does  
something special for lists, but no other types.

I could probably hack this up, but if someone with some more  
experience in this part of the code could indicate the 'right way',  
that'd be appreciated.

Regards,
James

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