MainPage.xaml

<Page
    x:Class="QuickStart.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:QuickStart"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <TextBlock Text="Quick Start" Margin="4,4,0,4" FontSize="32"></TextBlock>        
        <SwapChainPanel x:Name="SwapChainPanelTarget" Grid.Row="1" />      
        <StackPanel Grid.Row="2">            
            <TextBlock Text="Brightness" Margin="20,0,0,0"/>
            <Slider Minimum="-1.0" Maximum="1.0" StepFrequency="0.1" ValueChanged="OnBrightnessChanged" Margin="20,0" ></Slider>
        </StackPanel>
        <Image x:Name="OriginalImage" Grid.Row="1" Width="200" Height="200" Stretch="Uniform" 
               HorizontalAlignment="Left" VerticalAlignment="Top" Margin="12,12,0,0" />

        <Button Content="Pick an image" Click="PickImage_Click" HorizontalAlignment="Left" Grid.Row="3" />
        <Button Content="Save the image" Click="SaveImage_Click" x:Name="SaveButton" HorizontalAlignment="Right" Grid.Row="3" IsEnabled="False" />
    </Grid>
</Page>