OnElementPropertyChanged Doesn't Work Properly When Using With ViewRenderers

I created custom view and rendered it successfully.

I created bindable properties as in this example:
http://blog.xamarin.com/using-custom-controls-in-xamarin.forms-on-android/

In my view renderer, I have overridden OnElementPropertyChanged. It works properly with Xamarin.Forms properties, but doesn't get called by my custom properties.