T5 : Dependant dropdown boxes

[Steph]

Has anyone already tried to implement dependant dropdown boxes with the 
Ajax features of Tapestry 5.0.11 ?
I would like to implement a component to get a user address (country, 
zipcode, city) and i would like to present the user the cities according 
to the zipcode and the country just filled.

Any ideas ?
Stephane