The Flextras AutoCompleteComboBox is an extension of the Flex ComboBox. So, yes, the drop down that displays your data is a List. And you can customize the item display using itemRenderer.
More info is, here:
If you have any questions, contact me directly, and I'll help out. ( http://www.flextras.com/?event=ContactForm ).
If you get a chance to check it out, let me know what you think.
I jst looked at the features, i was actually searching for a free, yet easy to use autocomplete manager. but this one is close to a combobox.
Correct, our component is a commercial component.
If you want an AutoCompleteTextInput you can remove the "ComboBox" style by removing the down arrow on our component by setting the downArrowVisibile property to false.
If you're looking for some other feature, I don't fully understand what it is. If you can expand on that, I'd like to hear it.