Thanks Oliver, that has got me on the right track :)

Next question... When I click on the save address button (for example), the 
callback registers that the save button for address has been clicked and 
runs the required method in the callback. This then calls an async method 
in another class to save the address to a local SQLite instance. What would 
be the best way to pass back the success/failure of the database operation? 
Would it be on the eventbus, or is there a more preferred way?

Sorry for the noddy questions, but still learning!

Cheers

Tim

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