使用IWebBrowser2中遇到的问题

使用IWebBrowser2 怎么挂接 INewWindowManager::EvaluateNewWindow？
刚开始弄浏览器开发这块，使用了IWebBrowser2，为了拦截浏览器弹窗（window.ShowModalDialog)，得知INewWindowManager::EvaluateNewWindow可以做这件事，不造怎么挂接。求解答。

处理Webbrowser的NewWindow2/NewWindow3

When showModalDialog is called from script, the call is directed to the 
ScriptingCallableObject.showModalDialog which in turn calls the WebBrowser
derived object CustomWebBrowser.OnShowModalDialog().

        protected virtual void OnShowModalDialog(ShowModalDialogEventArgs 
eventArgs)
        {
             eventArgs.ReturnValue = this.ShowModalDialog(eventArgs.Dialog, 
eventArgs.VarArgIn, eventArgs.VarOptions);
        }

        private ManualResetEvent m_ModalDialogDone = null;
        private bool m_isModalDialog = false;
        private object m_ModalDialogVarArgIn = null;
        private string m_ModalDialogVarOptions = null;
        private object m_ModalDialogReturnValue = null;

        internal object ShowModalDialog(string dialog, object varArgIn, 
string varOptions)
        {
            CustomWebBrowser modalBrowser = 
Program.wrapperForm.CreateNewBrowserAndTab();
            modalBrowser.InitAsModalDialog(varArgIn, varOptions);
            modalBrowser.Navigate(dialog);
            while (!modalBrowser.m_ModalDialogDone.WaitOne(100, false)) {
                try {
                    Application.DoEvents();
                }
                catch (Exception ex) {
                 }
            }
            return modalBrowser.m_ModalDialogReturnValue;
        }

        private void InitAsModalDialog(object varArgIn, string varOptions)
        {
            m_isModalDialog = true;
            m_ModalDialogDone = new ManualResetEvent(false);
            m_ModalDialogVarArgIn = varArgIn;
            m_ModalDialogVarOptions = varOptions;
            IHTMLDocument2 doc2 = this.IE.Document as IHTMLDocument2;
            IHTMLWindow2 win2 = doc2.parentWindow;
            win2.opener = win2;
        }