    /**
     * @private
     */
    Ext.define('Ext.menu.KeyNav', {
        extend: 'Ext.util.KeyNav',

        requires: ['Ext.FocusManager'],

        constructor: function(menu) {
            var me = this;

            me.menu = menu;
            me.callParent([menu.el, {
                down: me.down,
                enter: me.enter,
                esc: me.escape,
                left: me.left,
                right: me.right,
                space: me.enter,
                tab: me.tab,
                up: me.up
            }]);
        },

        down: function(e) {
            var me = this,
                fi = me.menu.focusedItem;

            if (fi && e.getKey() == Ext.EventObject.DOWN && me.isWhitelisted(fi)) {
                return true;
            }
            me.focusNextItem(1);
        },

        enter: function(e) {
            var menu = this.menu,
                focused = menu.focusedItem;

            if (menu.activeItem) {
                menu.onClick(e);
            } else if (focused && focused.isFormField) {
                // prevent stopEvent being called
                return true;
            }
        },

        escape: function(e) {
            Ext.menu.Manager.hideAll();
        },

        focusNextItem: function(step) {
            var menu = this.menu,
                items = menu.items,
                focusedItem = menu.focusedItem,
                startIdx = focusedItem ? items.indexOf(focusedItem) : -1,
                idx = startIdx + step,
                item;

            while (idx != startIdx) {
                if (idx < 0) {
                    idx = items.length - 1;
                } else if (idx >= items.length) {
                    idx = 0;
                }

                item = items.getAt(idx);
                if (menu.canActivateItem(item)) {
                    menu.setActiveItem(item);
                    break;
                }
                idx += step;
            }
        },

        isWhitelisted: function(item) {
            return Ext.FocusManager.isWhitelisted(item);
        },

        left: function(e) {
            var menu = this.menu,
                fi = menu.focusedItem,
                ai = menu.activeItem;

            if (fi && this.isWhitelisted(fi)) {
                return true;
            }

            menu.hide();
            if (menu.parentMenu) {
                menu.parentMenu.focus();
            }
        },

        right: function(e) {
            var menu = this.menu,
                fi = menu.focusedItem,
                ai = menu.activeItem,
                am;

            if (fi && this.isWhitelisted(fi)) {
                return true;
            }

            if (ai) {
                am = menu.activeItem.menu;
                if (am) {
                    ai.expandMenu(0);
                    Ext.defer(function() {
                        am.setActiveItem(am.items.getAt(0));
                    }, 25);
                }
            }
        },

        tab: function(e) {
            var me = this;

            if (e.shiftKey) {
                me.up(e);
            } else {
                me.down(e);
            }
        },

        up: function(e) {
            var me = this,
                fi = me.menu.focusedItem;

            if (fi && e.getKey() == Ext.EventObject.UP && me.isWhitelisted(fi)) {
                return true;
            }
            me.focusNextItem(-1);
        }
    });