Hovering over disabled fields causes js error in IE 8

[maikhorma]

REQUIRED INFORMATION
Ext version tested:

• Ext 4.1

Browser versions tested against:

• IE8
• Chrome 21

Description:

Hovering over disabled fields in a window will produce the following js error in IE8. I think it only happens when you hover off and on the text inside the component. Seems easiest to recreate with a combobox. Works fine in chrome.

  'Ext.fly(...)' is null or not an object  ext-all.js, line 21 character 103901

I'm able to create it regularly on different machines so hopefully you can too.

Steps to reproduce the problem:

• go to any page that has extjs enabled, for ex http://dev.sencha.com/deploy/ext-4.1...ow/layout.html
• Paste this is IE's debug tools script tab
  

  Ext.create('widget.window',{items: [{xtype: 'combo', value: 'someText', disabled: true}], autoShow: true})

• Now hover your mouse over and off of "someText" in the disabled field. Within a few seconds you should get the error.

The result that was expected:

• no errors

The result that occurs instead:

• Ext.fly error

Operating System:

• Windows 7 64 bit
• Server 2003

[evant]

Thanks for the report, this is a dupe of EXTJSIV-5176.