保留列表selectedIndex在Flex中的数据绑定重新加载

In my Flex interface, I've got a few List components that are data bound to ArrayCollections. I'm finding that when the ArrayCollections are updated (by Web services) and the data bindings for the Lists update, each List is reset and its selectedIndex is dropped. This is a problem if a user is in the middle of a task and has already selected an item in the List, but hasn't yet submitted the form.In my Flex interface, I've got a few List compo