WpfExtended/WpfExtended.Test/TestApplication/MainWindow.xaml

<Window x:Class="WpfExtended.Test.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfExtended.Test"
        xmlns:controls="clr-namespace:WpfExtended.Tests.TestApplication.Controls"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="200" />
        </Grid.ColumnDefinitions>
        <ScrollViewer>
            <WrapPanel x:Name="WrapPanel" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"></WrapPanel>
        </ScrollViewer>
        <ScrollViewer Grid.Column="1">
            <controls:PropertyList x:Name="PropertyList"></controls:PropertyList>
        </ScrollViewer>
    </Grid>
</Window>