> By the way, how to kill the instance from the memory?

You don't, the singleton pattern is strictly for things that are
intended to live until the application terminates. This is the only
way to ensure you always get the same instance. Theme management is
obviously a good fit for the pattern as it has to be there until you
are done with the app.

In other cases, it might be good to keep around some objects in memory
because some browsers *cough*IE*cough* often keep things in memory way
past the time they should have made them disappear so it's a good idea
to reuse the memory that's already allocated.

Use common sense, a login window serves no purpose once the
application started but a config window could be reused.

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