Ext.menu inside a Panel with accordion layout

Hi I create a simple menu with ExtJS 5.1.0 using Sencha Cmd 5.1.0.26.

The component is very simple.

There is a panel component with a accordion layout.

Each item has a menu component with x items.

Here my code:

Code:

Ext.define("MyApp.view.mainMenu.MainMenu",{
    extend: "Ext.panel.Panel",
    requires: [
        'MyApp.view.mainMenu.MainMenuController',
        'MyApp.view.mainMenu.MainMenuModel',
    ],
        xtype:'mainMenu',
    controller: "mainmenu-mainmenu",
    viewModel: {
        type: "mainmenu-mainmenu"
    },


        region:'west',
        title:'Main Menu',
        collapsible: true,
        width:250,
        items:[
                {
                        xtype:'panel',
                        layout: {
                                type: 'accordion',
                                titleCollapse: false,
                                animate: true,
                                activeOnTop: false
                        },
                        items: [
                                { 
                                        title:'Menu 1',
                                        items:[
                                                {
                                                        xtype:'menu',
                                                        floating: false,
                                                        items: [
                                                                { text: 'regular item 11' },
                                                                { text: 'regular item 12' },
                                                                { text: 'regular item 13' },
                                                                { text: 'regular item 14' }
                                                        ]
                                                }
                                        ]
                                },
                                { 
                                        title:'Menu 2',
                                        items:[
                                                {
                                                        xtype:'menu',
                                                        floating: false,
                                                        items: [
                                                                { text: 'regular item 21' },
                                                                { text: 'regular item 22' },
                                                                { text: 'regular item 23' },
                                                                { text: 'regular item 24' }
                                                        ]
                                                }
                                        ]
                                },
                                { 
                                        title:'Menu 3',
                                        items:[
                                                {
                                                        xtype:'menu',
                                                        floating: false,
                                                        items: [
                                                                { text: 'regular item 31' },
                                                                { text: 'regular item 32' },
                                                                { text: 'regular item 33' },
                                                                { text: 'regular item 34' }
                                                        ]
                                                }
                                        ]
                                }
                        ]
                }
        ]
});

When I load the app the first time every works fine. First menu is show, if I chick con the second "+", second menu is shown, then if I click on the third menu "+" is shown.

If I came back to reopen the first menu item by clicking on the first "+" the menu content is blank. The menu component is no visible anymore.

I attach a screenshot to explain better what I see.

Any ideas?

Thanks for the tips.

Best regards

Ext.menu inside a Panel with accordion layout