Ext JS 6.5菜单自动隐藏

Question

我正在使用Ext JS 6.5.3.57。我有视图<{p>的文件Menu.js

// File /Users/donhuvy/Desktop/vy_sencha/app/view/menu/Menu.js

Ext.define('Acc.view.menu.Menu', {
    extend: 'Ext.Panel',
    xtype: 'menu_acc',

    requires: [
        'Ext.menu.Menu'
    ],

    autoSize: true,
    bodyPadding: 20,
    width: 230,
    items: {
        xtype: 'menu',
        floated: false,
        docked: 'left',
        alwaysOnTop: true,
        items: [{
            text: 'Cai dat He thong',
        },{
            text: 'Tien mat'
        },{
            text: 'regular item 3'
        }]
    }

})

档案app.js

// File /Users/donhuvy/Desktop/vy_sencha/app.js

/*
 * This file launches the application by asking Ext JS to create
 * and launch() the Application class.
 */
Ext.application({
    extend: 'Acc.Application',

    name: 'Acc',

    requires: [
        // This will automatically load all classes in the Acc namespace
        // so that application classes do not need to require each other.
        'Acc.*'
    ],

    // The name of the initial view to create.
    //mainView: 'Acc.view.main.Main'
    mainView: 'Acc.view.menu.Menu'

});

结果

当我按下菜单项时，它会自动隐藏。单击菜单项后如何避免隐藏？