WindowSoftInputMode doesn't work in Xamarin Forms Android

I work with XamarinForms and has some issues with Entry in ScrollView on Android platform. Autoscroll doesn't work correctly when I focuse on an entry placed in ScrollView. Entry appears above the keyboard but the whole page becomes unscrollable (I can't scroll completely to bottom or top of page). I try to set WindowSoftInputMode to adjustPan or adjustResize or both, and I try different ways to set it (in code, by attribute, directly in AndroidManifest.xml). But any case doesn't work (in each cases behavior remain the same). Please, maybe someone have encountered the same problem and I hope can help me. Thanks a lot.