How do I display a text in a active x control(safe control)?

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C#

ActiveX

I cannot access the password field control because it is an active x control while in the meantime I can access the username field using this code.

webBrowser1.DocumentCompleted -= new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
            HtmlWindow frame = webBrowser1.Document.GetElementById("indexFrame").Document.Window.Frames["indexFrame"];
            HtmlElement body = frame.Document.GetElementById("logonCardNum");
            body.SetAttribute("value", user);

Help?