public class Browser : EO.WinForm.WebControl

public Browser()
            : base()
        {
             if (this.WebView == null)
            {
                this.WebView = new WebView();
            }

            this.WebView.ObjectForScripting = new ExternalHost(this);

            this.WebView.BeforeDownload += WebView_BeforeDownload;
            this.WebView.DownloadCompleted += WebView_DownloadCompleted;
            this.WebView.NewWindow += WebView_NewWindow;// OnNewWindow;// WebView_NewWindow;
            this.WebView.NeedCredentials += WebView_NeedCredentials;
            this.WebView.CertificateError += WebView_CertificateError;
            this.WebView.LoadCompleted += WebView_LoadCompleted;
            this.WebView.Disposed += WebView_Disposed;
            EO.Base.Runtime.Exception += Runtime_Exception;
            this.ShowProgressBar();
            WebView.ShowDevTools(Handle);
            EO.WebBrowser.WebView.ShowDebugUI();

            int GiveMeInfo = CommandIds.RegisterUserCommand("GiveMeInfo");
            this.WebView.Shortcuts = new Shortcut[]
                {
                 new Shortcut(1, KeyCode.F5, true, true, false),
                new Shortcut(2, KeyCode.F12, true, true, false),
                new Shortcut(3, KeyCode.F4, true, true, false),
                };

            this.WebView.Command += WebView_Command;
        }

void Navigate()
{
//[color=red]Here it is throwing Exception[/color]
this.WebView.Url = SecuredURL;
}

this.WebView.ObjectForScripting = new ExternalHost(this);

    internal class ExternalHost
    {
        Browser browser;
        internal ExternalHost(Browser browserObject)
        {
            browser = browserObject;
        }

        public object Service(string serviceName)
        {
            object service = null;
            _Services.TryGetValue(serviceName, out service);
            return service;
        }

        public void Hello(string s)
        {
            MessageBox.Show("Hello From Script:" + s);
        }
    }

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
    public class aaParamsClientObject
    {
        string _EventName;
        public string EventName
        {
            get { return _EventName; }
            set { _EventName = value; }
        }

        private string GetXmlString()
        {
          //Some logic
         }
    }

// This line works
window.external.Hello('Hello from JavaScript!');
// The below two lines fails. I have multiple objects and I need invoke the different methods from different objects, hence I am storing those object in Service object and from that I want to call it.
// This worked in IE WebBrowser control, but here it is failing.
window.external.Service('aaParamsClientObject').EventName
window.external.Service('aaParamsClientObject').GetXmlString()

public function Get_aaParamsClientObject_XmlString()
{
    return Service("aaParamsClientObject").GetXmlString();
}