    /**
     * @class Ext.ux.grid.menu.ListMenu
     * @extends Ext.menu.Menu
     * This is a supporting class for {@link Ext.ux.grid.filter.ListFilter}.
     * Although not listed as configuration options for this class, this class
     * also accepts all configuration options from {@link Ext.ux.grid.filter.ListFilter}.
     */
    Ext.define('Ext.ux.grid.menu.ListMenu', {
        extend: 'Ext.menu.Menu',

        /**
         * @cfg {String} labelField
         * Defaults to 'text'.
         */
        labelField :  'text',
        /**
         * @cfg {String} paramPrefix
         * Defaults to 'Loading...'.
         */
        loadingText : 'Loading...',
        /**
         * @cfg {Boolean} loadOnShow
         * Defaults to true.
         */
        loadOnShow : true,
        /**
         * @cfg {Boolean} single
         * Specify true to group all items in this list into a single-select
         * radio button group. Defaults to false.
         */
        single : false,

        constructor : function (cfg) {
            var me = this,
                options,
                i,
                len,
                value;

            me.selected = [];
            me.addEvents(
                /**
                 * @event checkchange
                 * Fires when there is a change in checked items from this list
                 * @param {Object} item Ext.menu.CheckItem
                 * @param {Object} checked The checked value that was set
                 */
                'checkchange'
            );

            me.callParent([cfg = cfg || {}]);

            if(!cfg.store && cfg.options) {
                options = [];
                for(i = 0, len = cfg.options.length; i < len; i++){
                    value = cfg.options[i];
                    switch(Ext.type(value)){
                        case 'array':  options.push(value); break;
                        case 'object': options.push([value.id, value[me.labelField]]); break;
                        case 'string': options.push([value, value]); break;
                    }
                }

                me.store = Ext.create('Ext.data.ArrayStore', {
                    fields: ['id', me.labelField],
                    data:   options,
                    listeners: {
                        load: me.onLoad,
                        scope:  me
                    }
                });
                me.loaded = true;
                me.autoStore = true;
            } else {
                me.add({
                    text: me.loadingText,
                    iconCls: 'loading-indicator'
                });
                me.store.on('load', me.onLoad, me);
            }
        },

        destroy : function () {
            var me = this,
                store = me.store;

            if (store) {
                if (me.autoStore) {
                    store.destroyStore();
                } else {
                    store.un('unload', me.onLoad, me);
                }
            }
            me.callParent();
        },

        /**
         * Lists will initially show a 'loading' item while the data is retrieved from the store.
         * In some cases the loaded data will result in a list that goes off the screen to the
         * right (as placement calculations were done with the loading item). This adapter will
         * allow show to be called with no arguments to show with the previous arguments and
         * thus recalculate the width and potentially hang the menu from the left.
         */
        show : function () {
            if (this.loadOnShow && !this.loaded && !this.store.loading) {
                this.store.load();
            }
            this.callParent();
        },

        /** @private */
        onLoad : function (store, records) {
            var me = this,
                gid, itemValue, i, len,
                listeners = {
                    checkchange: me.checkChange,
                    scope: me
                };

            Ext.suspendLayouts();
            me.removeAll(true);

            gid = me.single ? Ext.id() : null;
            for (i = 0, len = records.length; i < len; i++) {
                itemValue = records[i].get('id');
                me.add(Ext.create('Ext.menu.CheckItem', {
                    text: records[i].get(me.labelField),
                    group: gid,
                    checked: Ext.Array.contains(me.selected, itemValue),
                    hideOnClick: false,
                    value: itemValue,
                    listeners: listeners
                }));
            }

            me.loaded = true;
            Ext.resumeLayouts(true);
            me.fireEvent('load', me, records);
        },

        /**
         * Get the selected items.
         * @return {Array} selected
         */
        getSelected : function () {
            return this.selected;
        },

        /** @private */
        setSelected : function (value) {
            value = this.selected = [].concat(value);

            if (this.loaded) {
                this.items.each(function(item){
                    item.setChecked(false, true);
                    for (var i = 0, len = value.length; i < len; i++) {
                        if (item.value == value[i]) {
                            item.setChecked(true, true);
                        }
                    }
                }, this);
            }
        },

        /**
         * Handler for the 'checkchange' event from an check item in this menu
         * @param {Object} item Ext.menu.CheckItem
         * @param {Object} checked The checked value that was set
         */
        checkChange : function (item, checked) {
            var value = [];
            this.items.each(function(item){
                if (item.checked) {
                    value.push(item.value);
                }
            },this);
            this.selected = value;

            this.fireEvent('checkchange', item, checked);
        }
    });