Problem with ui combobox event handler

Problem with ui combobox event handler

Hi,
First of all I'm quite new to jquery ...
I'm having trouble setting event handler on combobox.
Here is my code

Js
  1.     function update_autocomplete(event,ui) {
            alert("Udpate complete !");
        }

  2.     $("#s_start").combobox();
        $("#s_start").autocomplete({
            select: function(event,ui){
                update_autocomplete(event,ui);
               
            }
        });






Html
  1. <select id="s_start">
                            <option>Maschen</option>
                            <option>Malmo</option>
                            <option>Dortmund</option>
    </select>



I also tried
.bind( "autocompleteclose", function(event, ui)  {... });
but nothing works...
Any help would be very kind...

Best regards.