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    // private
    var sortWindows = function(d1, d2){
        return (!d1._lastAccess || d1._lastAccess < d2._lastAccess) ? -1 : 1;
    };

    // private
    var orderWindows = function(){
        var a = accessList, len = a.length;
        if(len > 0){
            a.sort(sortWindows);
            var seed = a[0].manager.zseed;
            for(var i = 0; i < len; i++){
                var win = a[i];
                if(win && !win.hidden){
                    win.setZIndex(seed + (i*10));
                }
            }
        }
        activateLast();
    };

    // private
    var setActiveWin = function(win){
        if(win != front){
            if(front){
                front.setActive(false);
            }
            front = win;
            if(win){
                win.setActive(true);
            }
        }
    };

    // private
    var activateLast = function(){
        for(var i = accessList.length-1; i >=0; --i) {
            if(!accessList[i].hidden){
                setActiveWin(accessList[i]);
                return;
            }
        }
        // none to activate
        setActiveWin(null);
    };

    return {
        /**
         * The starting z-index for windows in this WindowGroup (defaults to 9000)
         * @type Number The z-index value
         */
        zseed : 9000,

        /**
         * <p>Registers a {@link Ext.Window Window} with this WindowManager. This should not
         * need to be called under normal circumstances. Windows are automatically registered
         * with a {@link Ext.Window#manager manager} at construction time.</p>
         * <p>Where this may be useful is moving Windows between two WindowManagers. For example,
         * to bring the Ext.MessageBox dialog under the same manager as the Desktop's
         * WindowManager in the desktop sample app:</p><code><pre>
var msgWin = Ext.MessageBox.getDialog();
MyDesktop.getDesktop().getManager().register(msgWin);
</pre></code>
         * @param {Window} win The Window to register.
         */
        register : function(win){
            if(win.manager){
                win.manager.unregister(win);
            }
            win.manager = this;

            list[win.id] = win;
            accessList.push(win);
            win.on('hide', activateLast);
        },

        /**
         * <p>Unregisters a {@link Ext.Window Window} from this WindowManager. This should not
         * need to be called. Windows are automatically unregistered upon destruction.
         * See {@link #register}.</p>
         * @param {Window} win The Window to unregister.
         */
        unregister : function(win){
            delete win.manager;
            delete list[win.id];
            win.un('hide', activateLast);
            accessList.remove(win);
        },

        /**
         * Gets a registered window by id.
         * @param {String/Object} id The id of the window or a {@link Ext.Window} instance
         * @return {Ext.Window}
         */
        get : function(id){
            return typeof id == "object" ? id : list[id];
        },

        /**
         * Brings the specified window to the front of any other active windows in this WindowGroup.
         * @param {String/Object} win The id of the window or a {@link Ext.Window} instance
         * @return {Boolean} True if the dialog was brought to the front, else false
         * if it was already in front
         */
        bringToFront : function(win){
            win = this.get(win);
            if(win != front){
                win._lastAccess = new Date().getTime();
                orderWindows();
                return true;
            }
            return false;
        },

        /**
         * Sends the specified window to the back of other active windows in this WindowGroup.
         * @param {String/Object} win The id of the window or a {@link Ext.Window} instance
         * @return {Ext.Window} The window
         */
        sendToBack : function(win){