Geoffrey, >Instead of hiding the box, perhaps there could be an option to display a >message in the box that there are no matches to the users current input. In >situations where the user must select from the list (the input will have to >pass validation later) this could be helpful.
You can add this functionality by hooking in to the result() method. It allows you to assign a function which is run when the user finalizes their value (by selecting a value or blur from the field.) -Dan