handling onscroll event of WebBrowser (repost)

[Jocker]

I'll try reposting this message with the hope someone can help me with
this issue.
PS: is this the right newsgroup for this question?

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Hi Group
I'm writing an Internet Explorer plugin. Everything works well, except
when I try to handle the onscroll event.

>From MSDN it seems that IHTMLWindow2.on scroll property is the way to go

http://msdn.microsoft.com/workshop/b...ence/ifaces/wi...
http://msdn.microsoft.com/workshop/a...ce/events/onsc...
another possibility seems to exist with IHTMLElement2.o nscroll using
the document body, but this does not solve the problem.

the following code snippet compiles but when executed it always throws
a System.NotImple mentedException
this is the stack trace:
in mshtml.HTMLWind ow2Class.IHTMLW indow2_set_onsc roll(Object p)

this is the code:
-------
//WebBrowser is a valid instance of SHDocVw.WebBrow serClass
this.WebBrowser .DocumentComple te += new
DWebBrowserEven ts2_DocumentCom pleteEventHandl er(webBrowser_D ocumentComplete );

void webBrowser_Docu mentComplete(ob ject pDisp, ref object URL)
{
mshtml.IHTMLDoc ument2 document =
(mshtml.IHTMLDo cument2)this.We bBrowser.Docume nt;
mshtml.IHTMLWin dow2 window = document.parent Window;

try
{
//window.onscroll =
// new mshtml.HTMLWind owEvents_onscro llEventHandler(
// this.webBrowser Window_onscroll );
window.onscroll =
new mshtml.HTMLWind owEvents2_onscr ollEventHandler (
this.webBrowser Window_onscroll );
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString()) ;
}
}

private void webBrowserWindo w_onscroll()
{
MessageBox.Show ("scroll");
}

private void webBrowserWindo w_onscroll(msht ml.IHTMLEventOb j pEvtObj)
{
MessageBox.Show ("scroll2");
}

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any idea on what I'm doing wrong?
thanks
Claudio