beforeNavigation(String viewId) TODO
Invoked by the navigation handler before the new view component is created.
Parameters: viewId - The view ID to be created The view ID that should be used instead.
TODO
Invoked by the navigation handler before the new view component is created.
Parameters: viewId - The view ID to be created The view ID that should be used instead. If null, the view ID passedin will be used without modification.