Use dict as choices

[D3f0]

It'd be great to support dictionaries as choices for the Bullet class. This allows to present a user friendly input to the user, but keep arbitrary types as results, for example integers or callables.

[lelutin]

I'd also be interested to see this for the Check class, and also for the Scrollbar class. In the same way in those classes, you're choosing from a list of items so it'd be interesting to get a list of hidden values instead of displayed labels.