QuickLook/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml

<UserControl x:Class="QuickLook.Plugin.IPreviewHandlers.PreviewPanel"
             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"
             mc:Ignorable="d"
             x:Name="panel"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <WindowsFormsHost x:Name="presenter" />
    </Grid>
</UserControl>