<Window x:Class="Window3"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window3" Height="300" Width="300">
    <!--Top Grid-->
    <Grid Height="45" VerticalAlignment="Top">
        <Grid Height="612" Margin="0,0,0,-610" Name="Grid1" _
          VerticalAlignment="Bottom">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Label Background="Yellow" Grid.Column="0"/>
            <GridSplitter Grid.Column="0" Width="10" />
            <Label Background="Green" Grid.Column="1"/>
            <Grid Name="Grid2" Background="Black" Grid.Column="1" >
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"/>
               </Grid.RowDefinitions>
 
 
 
 
                <Grid> <!--Neus Grid in der rechten Spalte-->
                    <Grid.RowDefinitions>
                        <RowDefinition Height="152*" />
                        <RowDefinition Height="152*" />
                    </Grid.RowDefinitions>
                    <Label Background="Aqua" Grid.RowSpan="1" />
                    <Label Background="Red" Grid.Row="1" Grid.RowSpan="1" />
                    <GridSplitter Height="10" HorizontalAlignment="Stretch" _
                      Background="Beige" VerticalAlignment="Bottom" />
                </Grid><!--Ende Neus Grid in der rechten Spalte-->
 
 
 
            </Grid>
        </Grid>
    </Grid>
 
 
</Window>

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Ein Programmierer ist eine Maschine die Koffein in Programmcode umwandelt!
Und Bier in Bug?s

May the source code be with you.