Hi Thomas, Hi Ian,
 
many thanks to your replies. 
Sometimes it's that easy :)
 
> The first thing that leaps to the eye in your example is that you are not 
> passing 'this' to addListener(), so the "this.isSelectionEmpty" is in danger 
> of not getting the right context.
Your right thats nothing I would use in production. 
Please correct me, but 'this' in the handler-function reference the object the 
listener is added to, by default? Or is that not for sure?
 
> Interesting question. There are no any events for focused cell change.
I feared that I unlearned using the API... Glad to here that there is no event, 
or not glad about it... you know what I mean ;)
 
Regards,
Andreas
 
 

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