AutoComplete "enter" key behavior

[Ricky]

Hi,

I am trying to add a behavior to my autoComplete text field, where if i
press enter, it should be able to run a default search (with some text
input) and display a list of possible choices);

is it possible with autoComplete.add(new AjaxBehavior() {
           @Override
            public void onEvent() { }
} );

 or some other additional component ?

Any help would be appreciable.
Rick