Commands and buttons in different views

[LudwigNel]

So say you have a button in a menu which is in a region and a view in another region with a button performing the same function like a search.
How would one go about disabling both buttons if no search text is provided.
This is easily accomplished for the one using a delegate command and working with its CanExecute property.

I have an application commands class containing composite commands which I use to execute the one search for both buttons. But not sure how you would best handle "Can Execute" for both