Moving dialogs (with mouse)

Hey there. This library looks super cool and I've been playing around with it for the last few days. Something I can't figure out though is how to move a dialog (say, with the mouse). There was no mention to this in the docs.

I know that `ncurses-rs` supports this so I'm wondering: is it not exposed (or am I being too daft? :P). And if it's missing, how difficult it would be to implement