RadioButtonView.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="samples.core.Views.RadioButtonView" xmlns:behaviors="clr-namespace:samples.core.Behaviors" Title="Radio Buttons">
    <ListView x:Name="ListView_Radio" ItemTapped="Handle_ItemTapped" ItemSelected="Handle_ItemSelected" IsGroupingEnabled="true" HasUnevenRows="true">
        <!-- Group Header -->
        <ListView.GroupHeaderTemplate>
            <DataTemplate>
                <ViewCell>
                    <StackLayout BackgroundColor="{StaticResource MediumGray}">
                        <Label Margin="14,0" Text="{Binding Key}" FontSize="Large" VerticalOptions="CenterAndExpand"/>
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.GroupHeaderTemplate>
        <!--- Item Template -->
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <StackLayout Orientation="Horizontal">
                        <Label Margin="14,10" Text="{Binding Title}" FontSize="Large" VerticalTextAlignment="Center" HorizontalOptions="Start"/>
                        <Grid HorizontalOptions="EndAndExpand" Margin="14,0">
                            <Label Text="○" FontSize="20" TextColor="{StaticResource MediumGray}" VerticalTextAlignment="Center"/>
                            <Label Text="●" FontSize="20" TextColor="{StaticResource BrandColor}" IsVisible="{Binding IsSelected}" VerticalTextAlignment="Center" />
                        </Grid>
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
        <!-- Footer -->
        <ListView.Footer>
            <StackLayout Margin="10,15">
                <Button Text="Apply" HorizontalOptions="Center" WidthRequest="150" Clicked="Handle_Clicked"/>
            </StackLayout>
        </ListView.Footer>
    </ListView>
</ContentPage>