ActiveX Control Dispose(true) is not called

My C# ActiveX Control is hostet in IE 8. I want to execute code when the control is unloaded.

I tried the following:

...
public class ActiveXControl : Control 
{
    protected override void Dispose(bool disposing) 
    {
        if (disposing) 
        {
            // Cleanup
        }
    }
}
...

But disposing is allways false (Called from finalizer). As I need to access managed objects I cannot use that one.

How can I get the cleanup code to be called when the Browser "unloads" the control?

I found the IOle开发者_如何学CObject::Close method, which is implemented by the Control class but AFAIK ther's no way of overriding its behavior.

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I haven't done this, but as a suggestion to try: It might be possible to write a bit of javascript embedded in the html of on the web page that will call a method on your activeX control when the page is navigated away from. You could call your cleanup code from this method.

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You could override OnHandleDestroyed(), called when IE destroys the control window.