I have some very simple code: An autoload tab inside a tabpanel inside a window.

On IE7 it's throwing a 'null' is null or not an object error.

This seems to be a bug. The code works fine in Fx and Chrome.

Ext.onReady(function () {
    var myWindow = new Ext.Window({
        id: "MyWindow",
        hidden: false,
        height: 550,
        width: 750,
        layout: "fit",
        items: new Ext.TabPanel({
            id: "IBMTabPanel",
            activeTab: 0,
            items: [{
                id: "IBMTab2",
                title: "IBM Tab",
                xtype: "panel",
                autoLoad: {
                    url: "http://www.ibm.com"
I'm using Windows XP, IE7, ExtJS 3.2.0 to simulate this error.