<Window x:Class="WpfApplication1.Presentation.MainView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:rg="http://schemas.topics.it/wpf/radical/windows/presentation/regions"
        Title="MainView" Height="600" Width="800">

    <ContentPresenter rg:RegionService.Region="{rg:ContentPresenterRegion Name=ShellContentRegion}" />

</Window>