I am trying to do mixed authentication so that our Active directory users can log in with their AD logins but still allow Umbraco to control the memberships and roles.  The way I have done this in the past is to onAuthenticate validate the AD login and if that validates then replace the password with a default one that the membership and roles db will authenticate with.  In the code shown below the AD account validates but the ValidateUser does not.  Even with a non-AD user it still doesn't validate.  How do I validate against the Umbraco DB?  Thanks in advance for the help.

     protected void uxLogin_OnAuthenticate(object sender, AuthenticateEventArgs e)
     {
          string passw = uxLogin.Password.ToString();
          if (Common.ValidateActiveDirectoryLogin(ConfigurationManager.AppSettings.Get("Domain"), uxLogin.UserName, passw) == true)
          {
               passw = ConfigurationManager.AppSettings.Get("Pword");
          }
          UmbracoMembershipProvider UmbracoMembership = new UmbracoMembershipProvider();
          e.Authenticated = UmbracoMembership.ValidateUser(uxLogin.UserName, passw);
     }