YtIoT/WebRoot/res/extjs/docs/guides/components/examples/lazy_instantiation/app.js

/**
 * @example Lazy Instantiation
 *
 * A basic example demonstrating how a Container contains other items using the items config.
 */
Ext.require('Ext.tab.Panel');
Ext.require('Ext.window.MessageBox');

Ext.onReady(function() {

    Ext.create('Ext.tab.Panel', {
        renderTo: Ext.getBody(),
        height: 100,
        width: 200,
        items: [
            {
                // Explicitly define the xtype of this Component configuration.
                // This tells the Container (the tab panel in this case)
                // to instantiate a Ext.panel.Panel when it deems necessary
                xtype: 'panel',
                title: 'Tab One',
                html: 'The first tab',
                listeners: {
                    render: function() {
                        Ext.MessageBox.alert('Rendered One', 'Tab One was rendered.');
                    }
                }
            },
            {
                // this component configuration does not have an xtype since 'panel' is the default 
                // xtype for all Component configurations in a Container
                title: 'Tab Two',
                html: 'The second tab',
                listeners: {
                    render: function() {
                        Ext.MessageBox.alert('Rendered One', 'Tab Two was rendered.');
                    }
                }
            }
        ]
    });
});