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Steps to reproduce:
1. Create an application with a List-based control - eg List, DataGrid, or AdvancedDataGrid.
2. Set that control's focusRect attribute to "true".
3. Add another focusable control (eg a Button).
4. Run the application.
5. Select (tab or click) one of the List control's rows.
6. Use arrow keys to move up and/or down the list.

Here's an example that matches the above steps:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
  <mx:Button label="test"/>
  <mx:List horizontalCenter="0" verticalCenter="0" height="75%" width="75%" focusRect="true">
    <mx:dataProvider>
      <mx:Array>
        <mx:Object label="abc1"/>
        <mx:Object label="abc2"/>
        <mx:Object label="abc3"/>
        <mx:Object label="abc4"/>
      </mx:Array>
    </mx:dataProvider>
  </mx:List>
</mx:Application>
 
Actual Results:
After the first movement, both the List-based control and the "other" control (see step 3, the Button in the above example) show a focus rectangle (only one should, not both). After the first one or two movements, the browser crashes. The crash may be as simple as the browser-tab hanging, or as severe as the OS closing the browser instance.
 
Expected Results:
The List-based control should maintain focus, while the "other" control should not be affected at all. Naturally, the crash should not occurr.

Workaround (if any):
None. The problem does not occurr if the List-based control does not have focusRect set. Nor does it occur if the List-based control is the only control in the application. But neither of those are valid work-arounds.

This problem occurs on both IE7 and FF2.5.

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Steps to reproduce: 1. Create an application with a List-based control - eg List, DataGrid, or AdvancedDataGrid. 2. Set that control's focusRect attribute to "true". 3. Add another focusable control (eg a Button). 4. Run the application. 5. Select (tab or click) one of the List control's rows. 6. Use arrow keys to move up and/or down the list. Here's an example that matches the above steps: <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">   <mx:Button label="test"/>   <mx:List horizontalCenter="0" verticalCenter="0" height="75%" width="75%" focusRect="true">     <mx:dataProvider>       <mx:Array>         <mx:Object label="abc1"/>         <mx:Object label="abc2"/>         <mx:Object label="abc3"/>         <mx:Object label="abc4"/>       </mx:Array>     </mx:dataProvider>   </mx:List> </mx:Application>   Actual Results: After the first movement, both the List-based control and the "other" control (see step 3, the Button in the above example) show a focus rectangle (only one should, not both). After the first one or two movements, the browser crashes. The crash may be as simple as the browser-tab hanging, or as severe as the OS closing the browser instance.   Expected Results: The List-based control should maintain focus, while the "other" control should not be affected at all. Naturally, the crash should not occurr. Workaround (if any): None. The problem does not occurr if the List-based control does not have focusRect set. Nor does it occur if the List-based control is the only control in the application. But neither of those are valid work-arounds. This problem occurs on both IE7 and FF2.5.