Sencha Touch- Add a Nested List to a Tab Panel

Most of the code has been inspired from the sencha docs. Here is an example of a nested list inside a tab panel in Sencha Touch.

Ext.setup({
        onReady: function() {

var data = {
     text: 'Groceries',
     items: [{
         text: 'Drinks',
         items: [{
             text: 'Water',
             items: [{
                 text: 'Sparkling',
                 leaf: true
             }, {
                 text: 'Still',
                 leaf: true
             }]
         }, {
             text: 'Coffee',
             leaf: true
         }, {
             text: 'Espresso',
             leaf: true
         }, {
             text: 'Redbull',
             leaf: true
         }, {
             text: 'Coke',
             leaf: true
         }, {
             text: 'Diet Coke',
             leaf: true
         }]
     }, {
         text: 'Fruit',
         items: [{
             text: 'Bananas',
             leaf: true
         }, {
             text: 'Lemon',
             leaf: true
         }]
     }, {
         text: 'Snacks',
         items: [{
             text: 'Nuts',
             leaf: true
         }, {
             text: 'Pretzels',
             leaf: true
         }, {
             text: 'Wasabi Peas',
             leaf: true
         }]
     }]
 };

 Ext.define('ListItem', {
     extend: 'Ext.data.Model',
     config: {
         fields: [{
             name: 'text',
             type: 'string'
         }]
     }
 });

 var store = Ext.create('Ext.data.TreeStore', {
     model: 'ListItem',
     defaultRootProperty: 'items',
     root: data
 });

 var nestedList = Ext.create('Ext.NestedList', {
    // fullscreen: true,
     title: 'Groceries',
     xtype: 'nestedList',
     displayField: 'text',
     iconCls: 'user',
     store: store
 });

var tabPanel = new Ext.TabPanel({   
    fullscreen: true,
    ui: 'light',
    layout: 'card',
    animation: {
        type: 'cardslide',
        cover: true
    },
    tabBar: {
         docked: 'bottom',
        layout: {
            pack: 'center'
        }
    },
    animation: {
        type: 'cardslide',
        cover: true
    },
    items: [
       nestedList,
       {
            title: 'Home',
            iconCls: 'home',
            html: 'Home Screen'
        }
    ]
});