Mobile Services Authentication Behavior

Hi,

When using Azure Mobile Services to authenticate users with the facebook provider (using the code below) I notice that there is a white screen displayed for a brief moment before the login screen is displayed. this also happens when credentials have been cached and the azure service is authenticating through the provider..

Is there any way to prevent/hide the white screen so that when a user opens the app with cached credentials, there is no white screen displayed while azure authentication is performed?

Thanks,

David

private MobileServiceUser user;
private async System.Threading.Tasks.Task Authenticate()
{
    while (user == null)
    {
        string message;
        try
        {
            user = await App.MobileService
                .LoginAsync(MobileServiceAuthenticationProvider.Facebook);
            message = 
                string.Format("You are now logged in - {0}", user.UserId);
        }
        catch (InvalidOperationException)
        {
            message = "You must log in. Login Required";
        }

    MessageBox.Show(message);
}