I am the best message

Refer to the Messages.js file in the following code:

// app/view/messages/Messages.js
Ext.define('Postcard.view.messages.Messages', {
    extend: 'Ext.Panel',
    xtype: 'messages',
    controller: 'messages',
    viewModel: 'messages',
    autoScroll: true,
    session: true,
    bbar: [
        {
            xtype: 'combobox', displayField: 'name',
            idField: 'name',
            reference: 'tagPicker',
            queryMode: 'local', value: 'Inbox',
            bind: { store: '{tags}' }
        },
        {
            text: 'Set Tag',
            itemId: 'setTag'
        },
        '->',
        {
            text: 'Reply',
            itemId: 'reply',
            reference: 'replyButton'
        }
    ],
    items: [{
        xtype: 'dataview',
        bind: '{messages}',
        flex: 1,
        cls: 'message-view',
        tpl: new Ext.XTemplate('<tpl for=".">',
            '<div class="message">',
                '<div class="date"...