void UnfocusAll (View view) {
Layout<View> layoutOfView;
ScrollView scrollView;
ContentView contentView;
if (view == null) return;
if ((layoutOfView = view as Layout<View>) != null) {
foreach (var child in layoutOfView.Children)
UnfocusAll (child);
} else if ((scrollView = view as ScrollView) != null) {
UnfocusAll (scrollView.Content);
} else if ((contentView = view as ContentView) != null) {
UnfocusAll (contentView.Content);
} else {
view.Unfocus ();
}
}