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Created attachment 15664 [details]
In Xamarin.Forms.Platform.WinRT.dll, version 184.108.40.20653-pre2 the method Xamarin.Forms.Platform.WinRT.PageRenderer.OnElementChanged is not virtual. Therefore custom renderers cannot override it.
Furthermore the method OnElementPropertyChanged is missing. This method should also be virtual in all renderers.
Same happens on NavigationPageRenderer.
I pasted the wrong version its on the following version:
<package id="Xamarin.Forms" version="220.127.116.1190" targetFramework="wpa81" />
Created attachment 15665 [details]
Same on Xamarin Forms 18.104.22.16829
You should be able to override these. PageRenderer explicitly overrides OnElementChanged, but OnElementPropertyChanged is not overridden which is why it does not show up in the metadata. The Xamarin.Forms source code is open for you to view to see PageRenderer's implementation.