Auto applying element styles

Im set style in App.xaml

<Style x:Key="ContentPageStyle" TargetType="ContentPage"> <Setter Property="BackgroundColor" Value="{AppThemeBinding Light=#FFFFFF, Dark=#020202}" /></Style>

This style applying only case if set Style property for ContentPage element

<views:BasicView xmlns="http://xamarin.com/schemas/2014/forms"                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"                xmlns:views="clr-namespace:SkeletonApp.View.Page;assembly=SkeletonApp"                x:Class="SkeletonApp.Example.MainPage"                Style="{StaticResource ContentPageStyle}"                Title="Home"><!-- Content markup --></views:BasicView>

How can i do auto-applying styles when i set TargetType? It's truly possible?

And why style doesn't apply if i set Style property in parent class by next code

CS-file:

namespace SkeletonApp.View.Page{    public partial class BasicView : ContentPage    {        public BasicView() { }    }}

Markup-file:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             x:Class="SkeletonApp.View.Page.BasicView"             Style="{StaticResource ContentPageStyle}"></ContentPage>

UPD (full file App.xaml):

<?xml version="1.0" encoding="utf-8" ?><Application    x:Class="SkeletonApp.App"    xmlns="http://xamarin.com/schemas/2014/forms"    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"><Application.Resources><Color x:Key="TransparentColor">Transparent</Color><!-- Light colors --><Color x:Key="LightPageBackgroundColor">Magenta</Color><!-- Dark colors --><Color x:Key="DarkPageBackgroundColor">Lime</Color><Style x:Key="ContentPageStyle" TargetType="ContentPage"  ApplyToDerivedTypes = "True"> <Setter Property="BackgroundColor"                    Value="{AppThemeBinding Light={StaticResource LightPageBackgroundColor}, Dark={StaticResource DarkPageBackgroundColor}}" /></Style></Application.Resources></Application>