Although it was not done that way at the beginning, I think that the "onyx.MoreToolbar" should be extracted into a specific kind.
This new kind should generates event like "onReloadRequested" and "onResolutionChanged" with an object containing the width, height and  zoom.

This object could be:
* directly serialized in the localstorage, 
* passed to the designer to change the resolution settings requested by the user,
* passed to the designer to restore the resolution settings coming from the localstorage