WpfPreviewHandlerDemoControl.xaml

<UserControl x:Class="HandlerSamples.WpfPreviewHandlerDemoControl"
             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" Height="300" Width="300">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>

        <Image Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2" Grid.RowSpan="2" HorizontalAlignment="Stretch" Name="imgEncodedImage" Stretch="Fill" VerticalAlignment="Stretch" Opacity=".5"  />
        <Label Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="3" Content="Label" HorizontalAlignment="Stretch" Name="lblName" VerticalAlignment="Stretch"/>

        <ScrollViewer Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="3" Grid.RowSpan="2" Name="scrollViewer1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <TextBlock Name="txtContent" Text="TextBlock" TextAlignment="Left" TextWrapping="Wrap" />
        </ScrollViewer>

    </Grid>
</UserControl>