public AppDelegate () : base()
{
  //---- set any user default values (they're not actually set until 
  // the settings application is run for your app)
  NSUserDefaults.StandardUserDefaults.SetBool (true, "staySignedin");
  NSUserDefaults.StandardUserDefaults.SetString ("blue", "favoriteColor");

  //---- initialize our user settings, which loads them from the file (if they exist)
  NSUserDefaults.StandardUserDefaults.Init ();
}