FormsFlyout.xaml

<UserControl
    x:Class="Xamarin.Forms.Platform.UWP.FormsFlyout"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Xamarin.Forms.Platform.UAP"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

	<UserControl.Resources>
		<ResourceDictionary>
			<Style x:Key="ActionTitle" TargetType="TextBlock" BasedOn="{StaticResource SubtitleTextBlockStyle}">
				<Setter Property="FontSize" Value="18"/>
				<Setter Property="MaxLines" Value="2"/>
			</Style>

			<Style x:Key="ActionButton" TargetType="Button">
				<Setter Property="Height" Value="32" />
				<Setter Property="HorizontalAlignment" Value="Stretch" />
				<Setter Property="Margin" Value="5,0,0,0" />
			</Style>

			<Style x:Key="LeftActionButton" TargetType="Button" BasedOn="{StaticResource ActionButton}">
				<Setter Property="Margin" Value="0,0,5,0"/>
			</Style>

			<Style x:Key="ActionSheetList" TargetType="ListView">
				<Setter Property="Margin" Value="0,10,0,10"/>
				<Setter Property="IsItemClickEnabled" Value="true"/>
				<Setter Property="SelectionMode" Value="None" />
				<Setter Property="ItemContainerStyle">
					<Setter.Value>
						<Style TargetType="ListViewItem">
							<Setter Property="Margin" Value="0" />
							<Setter Property="HorizontalContentAlignment" Value="Stretch" />
						</Style>
					</Setter.Value>
				</Setter>
				<Setter Property="ItemTemplate">
					<Setter.Value>
						<DataTemplate>
							<TextBlock Text="{Binding}" HorizontalAlignment="Stretch" VerticalAlignment="Center" FontSize="16" />
						</DataTemplate>
					</Setter.Value>
				</Setter>
			</Style>
		</ResourceDictionary>
	</UserControl.Resources>

	<Grid Padding="10">
		<Grid.RowDefinitions>
			<RowDefinition Height="*"/>
			<RowDefinition Height="auto"/>
		</Grid.RowDefinitions>

		<Grid>
			<Grid.RowDefinitions>
				<RowDefinition Height="auto"/>
				<RowDefinition Height="*"/>
			</Grid.RowDefinitions>

			<TextBlock x:Name="TitleBlock" Style="{StaticResource ActionTitle}"/>
			<ListView x:Name="OptionsList" Grid.Row="1" 
					  Style="{StaticResource ActionSheetList}" 
					  ItemClick="ListItemSelected" />

		</Grid>
		
		<Grid Grid.Row="1" VerticalAlignment="Bottom">
			<Grid.ColumnDefinitions>
				<ColumnDefinition Width="*"/>
				<ColumnDefinition Width="*"/>
			</Grid.ColumnDefinitions>

			<Button x:Name="LeftBtn" Grid.Column="0" 
					Style="{StaticResource LeftActionButton}"
					Click="ActionButtonClicked"/>
			<Button x:Name="RightBtn" Grid.Column="1" 
					Style="{StaticResource ActionButton}" 
					Click="ActionButtonClicked"/>
		</Grid>
	</Grid>
</UserControl>