bind specific property from combobox datasource

I have an BeanContainer. For this container, item id it’s set to some property named “id” that has integer type. This container is datasource for an combobox that display another item property named “name” (String type). I want to bind selected item in combobox to some property, named “country” (String type ) in another bean using BeanFieldGroup. But i got error about convesion exception. Seem that BeanFieldGroup try to bind “id” to “country”, so i got this exception.
How can set BeanFieldFactory to bind property “name” from selected value in combobox to “country” property.
In my test, binder is used like this:

binder.bind(myCombo, "country");

Thanks in advance!!!