Question about Autocomplete

I have a question about the built in "html jQuery this autocomplete". I have a domain object which has a field that is chosen using an autocomplete list. The problem is when I have created an instance of this domain class, chosen an item from the list, and then later on I want to edit it. To edit that field, that is, to select other item from the list, I have to manually erase and start typing again in the input field ok? However...if I click OUTSIDE the autocomplete list popup, the callback of that field is obviously not invoked, so that the remain value remains. I think this may confuse some users, as they may think the object was saved with what they typed but if they clicked outside the popup...the value will be the old one. 

The most critical use-case I have here is when I want to "unselect/nil" an already selected item. In my list, I do have an "empty" item. If the user clicks on in, that's perfect, the callback is executed and the field gets a nil. But if the user removes all the input field, and do not click/select the "empty" item, then even if the input is empty...it will remain the old value.

Is there a way to fix this? 

Thanks in advance,
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Mariano
http://marianopeck.wordpress.com