(function( $ ) {
        	$.widget( "ui.combobox", {
        		_create: function() {
        			var self = this,
        			select = this.element.hide(),
        			selected = select.children( ":selected" ),
        			value = selected.val() ? selected.text() : "";
        			var input = this.input = $( "<input>" )
        			.insertAfter( select )
        			.val( value )
        			.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;
        					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 ).text().match( matcher ) ) {
        								this.selected = valid = true;
        								return false;
        							}
        						});
        						if ( !valid ) {
        							// remove invalid value, as it didn't match anything
        							$( this ).val( "" );
        							select.val( "" );
        							input.data( "autocomplete" ).term = "";
        							return false;
        						}
        					}
        				}
        			})
        			.addClass( "ui-widget ui-widget-content ui-corner-left" );

        			input.data( "autocomplete" )._renderItem = function( ul, item ) {
        				return $( "<li></li>" )
        				.data( "item.autocomplete", item )
        				.append( "<a>" + item.label + "</a>" )
        				.appendTo( ul );
        			};

        			this.button = $( "<button type='button'>&nbsp;</button>" )
        			.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;
        				}

        				// work around a bug (likely same cause as #5265)
        				$( this ).blur();

        				// pass empty string as value to search for, displaying all results
        				input.autocomplete( "search", "" );
        				input.focus();
        			});
        		},

        		destroy: function() {
        			this.input.remove();
        			this.button.remove();
        			this.element.show();
        			$.Widget.prototype.destroy.call( this );
        		}
        	});
        })( jQuery );