PageControlStyle.xaml

<ResourceDictionary
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:uwp="using:Xamarin.Forms.Platform.UWP">
	<Style TargetType="uwp:PageControl">
		<Setter Property="ContentMargin" Value="0" />
		<Setter Property="TitleBrush" Value="{ThemeResource DefaultTextForegroundThemeBrush}" />
		<Setter Property="Template">
			<Setter.Value>
				<ControlTemplate TargetType="uwp:PageControl">
					<Grid Background="{TemplateBinding Background}">
						
						<Grid.RowDefinitions>
							<RowDefinition Height="Auto" />
							<RowDefinition Height="*" />
							<RowDefinition Height="Auto" />
						</Grid.RowDefinitions>

                        <Border x:Name="TopCommandBarArea" HorizontalAlignment="Stretch" Background="{TemplateBinding ToolbarBackground}">
                            <uwp:FormsCommandBar x:Name="CommandBar" Background="{TemplateBinding ToolbarBackground}" MinHeight="{ThemeResource TitleBarHeight}">
                                <uwp:FormsCommandBar.Content>
                                    <Border x:Name="TitleArea" Visibility="{TemplateBinding TitleVisibility}" Height="{ThemeResource TitleBarHeight}">
                                        <TextBlock Text="{Binding Title}" TextWrapping="NoWrap" VerticalAlignment="Center" Margin="10,0,0,0" Foreground="{TemplateBinding TitleBrush}" Style="{ThemeResource TitleTextBlockStyle}" />
                                    </Border>
                                </uwp:FormsCommandBar.Content>
                             </uwp:FormsCommandBar>
                        </Border>

						<uwp:FormsPresenter Margin="{TemplateBinding ContentMargin}" ContentTransitions="{TemplateBinding ContentTransitions}" x:Name="presenter" Grid.Row="1" />

						<Border x:Name="BottomCommandBarArea" Grid.Row="2" HorizontalAlignment="Stretch"></Border>
					</Grid>
				</ControlTemplate>
			</Setter.Value>
		</Setter>
	</Style>
</ResourceDictionary>