How to use cookies in VB.net's Web Browser

Hi, I need a way to use cookies in the default web browser in vb.net.

I log in to a secure web site with a http web request, then use the response to set the web browser document text.

Code:

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'Login to web page
            Dim login As HttpWebRequest = DirectCast(WebRequest.Create("MY SITE HERE"), HttpWebRequest)
            login.CookieContainer = LoadingScreen.LoginCookie
            Dim loginresponse As HttpWebResponse = DirectCast(login.GetResponse, HttpWebResponse)
            LoadingScreen.LoginCookie.Add(loginresponse.Cookies)

'Navigate to location
            Dim filepageread As New StreamReader(loginresponse.GetResponseStream)
            Dim pagedata As String = filepageread.ReadToEnd()
            WebBrowser1.DocumentText = pagedata

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That all works, but then when I try to use the web browser to navigate around the site, it says that cookies must be enabled?
Does anyone have any ideas