I have encountered one interesting question about "DesktopCleanup"

There are two ways to do something after closing the browser:

public class MyDesktopCleanup implements DesktopCleanup {
public void cleanup(Desktop arg0) throws Exception

{ System.out.println("Close browser======"); }

}
then write into zk.xml: listener description:MyDesktopCleanup listener-class:com.text.MyDesktopCleanup

============= or, you can do this: ==========================

@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);

comp.getDesktop().addListener(new DesktopCleanup() {
public void cleanup(Desktop desktop) throws Exception

{ System.out.println("Close browser======"); }

});
}
I have test these two methods in Chrome and firefox, they both operated well and print :"Close browser======". But if I run this in IE 9, something interesting happened: after running the web project and I open IE 9 to access the web page. Before closing IE, I do nothing, then the DesktopCleanup is called and it is right. However, if I do something like upload files on web page, after closing IE, the DesktopCleanup would be not called.

So, how can I resolve this problem ? Thank you very much!