Order code executes

Hi guys,

I have the following on 2 different button clicks:

Button1:

WebBrowser_Sourcing_BrokerForum_Enquiry.Navigate(new Uri(" http://www.brokerforum.com/iris-parts-search.authenticated-en.jsa"));

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Button2:

 try
            {


                var htmlDoc1 = (HTMLDocument)WebBrowser_Sourcing_BrokerForum_Enquiry.Document;


                var UsernameTextBox = (mshtml.HTMLInputElement)htmlDoc1.all.item("Session_Username", 0);
                UsernameTextBox.value = "XXXX";

                var PasswordTextBox = (mshtml.HTMLInputElement)htmlDoc1.all.item("Session_Password", 0);
                PasswordTextBox.value = "XXXX";



                foreach (mshtml.HTMLInputElement HTMLI in ((mshtml.HTMLDocument)WebBrowser_Sourcing_BrokerForum_Enquiry.Document).getElementsByTagName("input"))
                {

                    if (HTMLI.getAttribute("type").Equals("image"))
                    {
                        if (HTMLI.src == "http://www.brokerforum.com/tbf/img/login-button-en.png")
                        {

                            HTMLI.click();
                            return;
                        }
                    }


                }
            }

            catch (Exception) { }

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This all works fine. But when I combine the 2 into a 'loaded' grid event the login never occurs. Why do they work separately on buttons but not when combined? Is it the order the code is executing?

Thanks,
Dean