Live Refreshing grid

HTML

<script src="http://cdn.sencha.io/ext-4.2.0-gpl/ext-all-dev.js"></script>
<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.2.0-gpl/resources/css/ext-all.css">
<script src="http://cdn.sencha.io/ext-4.2.0-gpl/examples/ux/statusbar/StatusBar.js"></script>
<script src="http://cdn.sencha.io/ext-4.2.0-gpl/examples/ux/LiveSearchGridPanel.js"></script>

JavaScript

Ext.onReady(function () {
    Ext.Loader.setConfig({
        disableCaching: false,
        enabled: true,
        paths: {
            'Ext.ux': 'http://cdn.sencha.io/ext-4.2.0-gpl/examples/ux'
        }
    });
    Ext.require(['Ext.ux.statusbar.StatusBar'], function () {
        var store = Ext.create('Ext.data.Store', {
            fields: ['hbc_status', 'phi_first_name', 'phi_last_name'],
            data: [{
                hbc_status: 'a',
                phi_first_name: 'John',
                phi_last_name: 'Do'
            }]
        });

        var runner = new Ext.util.TaskRunner();

        var grid = Ext.create('Ext.grid.Panel', {
            height: 400,
            title: "Admissions222",
            frame: true,
            renderTo: Ext.getBody(),
            store: store,
            loadMask: true,
            columns: [{
                header: 'Status',
                dataIndex: 'hbc_status'
            }, {
                header: 'First Name',
                dataIndex: 'phi_first_name'
            }, {
                header: 'Last Name',
                dataIndex: 'phi_last_name'
            }],
            dockedItems: [{
                xtype: 'toolbar',
                dock: 'bottom',
                items: [{
                    text: 'Export CSV',
                    iconCls: 'add15',
                    menu: [{
                        xtype: 'form',
                        standardSubmit: true,
                        id: 'form',
                        bodyPadding: 5,
                        items: [{
                            xtype: 'datefield',
                            fieldLabel: 'From:',
                            name: 'start_date',
                            format: 'Y-m-d',
                            dataIndex: 'start_date'
                        }, {
                            xtype: 'datefield',
                            fieldLabel: 'To:',
                            name: 'end_date',
                      ...