I'm trying to create a site that requires login. Its entirely designed in silverlight. So my first page, home.xaml loads in mysite.aspx and it basically has a login page. AFter login, the user is redirected to another page user.aspx. in that page, i've embedded another silverlight control called nav.xaml. so now when user.aspx loads it is supposed to load a silverlight control. i've programmed app.xaml.vb such that it loads nav.xaml in the rootlayout when the page requesting is user.aspx. but for some reason its not working. my app.xaml.vb code: Private Sub Application_Startup(ByVal o As Object, ByVal e As StartupEventArgs) Handles Me.Startup If e.InitParams.ContainsKey("ReqPage") Then If e.InitParams("ReqPage") = "userpage" Then Me.RootVisual = New Nav() End If Else Me.RootVisual = New Home() End If End Sub in IE, half of the nav.xaml is rendered. but in firefox nothing is rendered. so wats going on exactly? pls help!