(function( $ ) {
   $.widget( "ui.combobox", {      
      _create: function() {
         var self = this;
         var select = this.element,
            theWidth = select.width(),
            selected = select.children( ":selected" ),
            theTitle = select.attr('title'),
            value = selected.val() ? selected.text() : "";         
         select.hide();
         var input = $( "<input>" )
            .val( value )
            .attr('title', '' + theTitle + '')
            .autocomplete({
               delay: 0,
               minLength: 0,
               source: function( request, response ) {
                  var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
                  response( select.children( "option" ).map(function() {
                     var text = $( this ).text();
                     if ( this.value && ( !request.term || matcher.test(text) ) )
                        return {
                           label: text.replace(
                              new RegExp(
                                 "(?![^&;]+;)(?!<[^<>]*)(" +
                                 $.ui.autocomplete.escapeRegex(request.term) +
                                 ")(?![^<>]*>)(?![^&;]+;)", "gi"
                              ), "<strong>$1</strong>" ),
                           value: text,
                           option: this
                        };
                  }) );
               },
               select: function( event, ui ) {
                  ui.item.option.selected = true;
                  //select.val( ui.item.option.value );
                  self._trigger( "selected", event, {
                     item: ui.item.option
                  });
               },
               change: function( event, ui ) {
                  if ( !ui.item ) {
                     var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( $(this).val() ) + "$", "i" ),
                        valid = false;
                     select.children( "option" ).each(function() {
                        if ( this.value.match( matcher ) ) {
                           this.selected = valid = true;
                           return false;
                        }
                     });
                     if ( !valid ) {
                        // remove invalid value, as it didn't match anything
                        $( this ).val( "" );
                        select.val( "" );
                        return false;
                     }
                  }
               }
            })
            .addClass( "ui-widget ui-widget-content ui-corner-left" );
         var span = $("<span style=\" white-space: nowrap;\"></span>")
               .append(input).insertAfter( select );
         input.data( "autocomplete" )._renderItem = function( ul, item ) {
            return $( "<li></li>" )
               .data( "item.autocomplete", item )
               .append( "<a>" + item.label + "</a>" )
               .appendTo( ul );
         };

         $( "<button>&nbsp;</button>" )
            .click(function() { /*Don't submit form.*/ return false;})
            .attr( "tabIndex", -1 )
            .attr( "title", "Show All Items" )
            .insertAfter( input )
            .button({
               icons: {
                  primary: "ui-icon-triangle-1-s"
               },
               text: false
            })
            .removeClass( "ui-corner-all" )
            .addClass( "ui-corner-right ui-button-icon" )
            .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);