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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.
I have checked this issue and observed that the method Xamarin.Forms.Platform.WinRT.PageRenderer.OnElementChanged is virtual Like "protected virtual void OnElementChanged".
Could you please provide me few steps? so that I can reproduce it at our end.
It has been fixed in the meantime (with 1.4.3-pre1 I believe). You can close this bug.
OnElementPropertyChanged is still missing. But this is the case in many renderers also for other platforms, so I don't think that it will be changed.