ComboBox Linker

Ok so I have to admit that I have had to solve this problem several times over the past 12 years of programming. The problem is fairly generic and up untill now there was no general solution to it in Habanero.Faces.

The problem is when you have two combo boxes that are linked i.e. the data from the first combo box filters the data in the second combo box. e.g. Select a Country and you get a filtered list of States for that country.