Silverlight client hanged when closing the browser window

[DarioCrivelli]

Please reproduce the following test:

1. launch a new instance of IE8 (v 8.0.7600.16385)
2. open the online Silverlight demo http://www.lightstreamer.com/demo/Si..._StockListDemo through the address bar
3. activate the demo fully, through the subscribe button
4. close the browser

I see that two iexplore processes are created after step 1, then no more.
After step 4, the two processes disappear.
Do you notice the same?
If not, is there any other sequence of actions that triggers the issue (preferably based on the online demo)?
(I'm using windows 7 with Silverlight 4)