Webbrowser control login problem

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VB

Hi,

I am using webbrowser control to login into https://www.itslb.com/tms/ website. I have written code for that but i am facing problem with password input type when i run this code password input box remain blank username contain value so why is it happen
My code like below

Dim frmform As HtmlElement = WebBrowser1.Document.Forms("aspnetForm")
           frmform.All("ctl00_lnkLogin").InvokeMember("Click")

           frmform.All("ctl00_txtUserName").SetAttribute("value", sUserID)
           frmform.All("ctl00_txtPassword").SetAttribute("value", sPWD)
           frmform.GetElementsByTagName("select")(0).Document.GetElementsByTagName("option")(1).SetAttribute("selected", "true")

           'frmform.All("ctl00$cboTerminal").InvokeMember("SelectedIndexChanged")
           'frmform.GetElementsByTagName("select")(0).Document.GetElementsByTagName("option")(1).SetAttribute("selected", "true")
           frmform.All("ctl00_btnLogin").Enabled = True
           frmform.All("ctl00_btnLogin").InvokeMember("Submit")