Hi!
I changed my MainActivity to use FormsAppCompatActivity to be able to support Android 6.0 Runtime Permission, which was pretty messy to fix in Xamarin Forms.
When I did this, I had to change my styles.xml to instead of using @android:style/Theme.Material.Light and @android:style/Theme.Holo.Light, since FormsAppCompatActivity demanded it.
When building and running the new version, my buttons and other objects looked a bit different than before. Now the app got material support on devices < 5.0, which is great 
.
Button attributes like BorderRadius = 10, BorderWidth = 1, BorderColor = Color.White.ToFormsColor () is not working anymore.
Also buttons that I had with transparent background got a shadow around it. It seems to be possible to set android:stateListAnimator="@null" on buttons to remove the shadow.
Do I need to create a custom renderer to fix my problems??