List in float panel with navigation view

Hi,

I try add list to float panel with navigation view, but it not showing. When I adding list to panel (without navigation) it's showing. How I can fix it? Thanks.

Example code - http://ift.tt/TDlJiJ

or

Code:

Ext.define('T2T.view.ChatList', {    extend: 'Ext.Panel',
    alias: 'widget.chatlistmodalpanel',


    config: {
        left: 0,
        right: 5,
        bottom: 0,
        modal: true,
        hideOnMaskTap: true,
        hidden: true,
        layout: 'fit',
        items: [
            {
                xtype: 'navigationview',
                id: 'chatlist_navigation_bar',
                navigationBar : {
                    items : []
                },
                //scrollable: {
                //    direction: 'vertical',
                //    directionLock: true
                //},
                items   : [
                    {
                        title: 'Messages',
                        items: [
                            {
                                xtype: 'list',
                                id: 'chat_users_list',
                                emptyText:'No Chats.',
                                itemTpl: '{name}',
                                data: [
                                    {name: 'Cowper'},
                                    {name: 'Everett'},
                                    {name: 'University'},
                                     {name: 'Forest'}
                                ]
                            }
                        ]
                    }
                ]
            }
        ]
    }
});

I can use toolbar but I wants push to navigation view another view after select item in list.