How to refresh a stage with new code from main window

[pvdz]

There needs to be at least some code example that refreshes a stage by supplying new code. Something you could do from the console, for instance. Or actually something orbit is already doing.

Right now I'm simply destroying the movie and creating a whole new instance, but that can hardly be the "right" way (tm)?

Either way, please put up an example on how to refresh and manipulate the stage from "the outside".