The actions of RegistrationBirthdayScreen: the method you call on its handle while the screen is open.
Picks the day, month and year and taps Next. A birthday the server refuses (an under-age one included) is the typed RegistrationInvalidBirthdayError; an accepted one answers the name screen's handle.
RegistrationInvalidBirthdayError
The actions of RegistrationBirthdayScreen: the method you call on its handle while the screen is open.