Enable the rateApp Event

rateapp_2.cs

	private void OnCoronaRuntimeLoaded(
		object sender, CoronaLabs.Corona.WinRT.CoronaRuntimeEventArgs e)
	{
		// Keep a reference to the Corona runtime environment.
		// It's needed so that your login window's results can be dispatched to Corona.
		fCoronaRuntimeEnvironment = e.CoronaRuntimeEnvironment;
		fCoronaRuntimeEnvironment.AddEventListener("rateApp", rateApp);
	}