Flex: dynamic filtering (like google's or google finance)

I wanted to put a search box in my flex app that would act just like google or google finance: you start typing and a drop down list just below starts filtering the results dynamically. 开发者_如何学运维Does anyone know how to do this in flex? I am using flex and php so as the user types it will pull results off the server dynamically.

thanks!

This is usually called "AutoComplete", and there appear to be a number of them. Here's one.