I am trying to change my comboboxes to use autocomplete so i leverage the code listed here (which worked perfectly for my dropdowns)

The issue is that i also on the same page have a listbox with the following code:

<%= Html.ListBox("Cars", Model.BodyParts.Select(
                    x => new SelectListItem {
                        Text = x.Name,
                        Value = x.Id,
                        Selected = Model.CarsSelected.Any(y => y.Id == x.Id)
                    }
               ))%>

and it appears that the jquery ui code is changing this to a autocomplete dropdown as well (as opposed to keeping it as a multi select list box)

any idea how to prevent this from happening?

i literally am just using the exact code on this page

<script type="text/javascript">
(function($) {
    $.widget("ui.combobox", {
        _create: function() {
            var self = this;
            var select = this.element.hide();
            var input = $("<input>")
                .insertAfter(select)
                .autocomplete({
                    source: function(request, response) {
                        var matcher = new RegExp(request.term, "i");
                        response(select.children("option").map(function() {
                            var text = $(this).text();
                            if (!request.term || matcher.test(text))
                                return {
                                    id: $(this).val(),
                                    label: text.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + request.term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>"),
                                    value: text
                                };
                        }));
                    },
                    delay: 0,
                    select: function(e, ui) {
                        if (!ui.item) {
                            // remove invalid value, as it didn't match anything
                            $(this).val("");
                            return false;
                        }
                        $(this).focus();
                        select.val(ui.item.id);
                        self._trigger("selected", null, {
                            item: select.find("[value='" + ui.item.id + "']")
                        });

                    },
                    minLength: 0
                })
                .addClass("ui-widget ui-widget-content ui-corner-left");
            $("<button>&nbsp;</button>")
            .insertAfter(input)
            .button({
                icons: {
                    primary: "ui-icon-triangle-1-s"
                },
                text: false
            }).removeClass("ui-corner-all")
            .addClass("ui-corner-right ui-button-icon")
            .position({
                my: "left center",
                at: "right center",
                of: input,
                offset: "-1 0"
            }).css("top", "")
            .click(function() {
                // close if already visible
                if (input.autocomplete("widget").is(":visible")) {
                    input.autocomplete("close");
                    return;
                }
                // pass empty string as value to search for, displaying all results
                input.autocomplete("search", "");
                input.focus();
            });
        }
    });

})(jQuery);

$(function() {
    $("select").combobox();
});
</script>