JQuery :: Can't Bind Event To A Combobox

I'm attempting to bind an event to a combo box, so that when a value is selected I can kick off a function. I cannot seem to bind an event successfully. I have looked at the .select event and tried it, and perhaps I don't understand how this code is to be used:

Supply a callback function to handle theselectevent as an init option.$( ".selector" ).autocomplete({ select: function(event, ui) { ... } });Bind to theselectevent by type:autocompleteselect.$( ".selector" ).bind( "autocompleteselect", function(event, ui) { ...
});

Do I need to add both of these? Just one? I've found the place in the combobox code where the underlying select box changes, but I don't want to hack at this code. I'd be happy to look at a successful implementation.