QuickLook/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml

<UserControl x:Class="QuickLook.Plugin.ImageViewer.ImagePanel"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:QuickLook.Plugin.ImageViewer"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <ScrollViewer x:Name="viewPanel" BorderThickness="0" HorizontalScrollBarVisibility="Auto"
                      VerticalScrollBarVisibility="Auto" Focusable="False">
            <Image x:Name="viewPanelImage" Stretch="None" RenderOptions.BitmapScalingMode="HighQuality" />
        </ScrollViewer>
    </Grid>
</UserControl>