which isn't working. I mean, in the mvc model, the URL token group has been edited, but it didn't display in the URL.
After some tries around, I have noticed that when one more dropdown is added manually and associated to a token, and when it changes (and so the URL), the token "my_key" is pushed in the URL! So I guess that the native dropdown does something on the "onChange" to push the key in the URL.
I've tried randomly many functions in the "url" component prototypes (encode, validate, fetch, ...) but none of them seem to work, and the documentation about this is more than light.