Thanks! I added a little so that the click will toggle between open and closed, like most comboboxes do:
var cc = $('#cc ');
cc .combobox('textbox').bind('click', function() {
if (cc .combobox('panel').parent().css('display') === 'none') {
cc .combobox('showPanel');
}
else {
cc .combobox('hidePanel');
}
});