New Post: ChildWindow changes

Maybe it will help if I post all of my code:

<Grid x:Name="MainGrid">

        <ExtendedToolkit:WindowContainer Name="xWindowContainer">
            <ExtendedToolkit:ChildWindow Name="ChildWindow" WindowState="{Binding ChildWindowVisible, Mode=TwoWay}" Caption="{Binding ChildWindowCaption}" 
                                     WindowStartupLocation="Center" IsModal="True" CloseButtonVisibility="{Binding ChildWindowCanExit, Converter={StaticResource BooleanToVisibilityConverter}}" Loaded="ChildWindow_Loaded" 
                                     SizeChanged="ChildWindow_SizeChanged" Closing="ChildWindow_Closing">
                <ContentControl HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Content="{Binding ChildContent}"/>
            </ExtendedToolkit:ChildWindow>

            <ExtendedToolkit:ChildWindow Name="ChildWindowError" WindowState="{Binding ErrorWindowVisible}" Caption="{Binding ErrorWindowCaption}" 
                                     WindowStartupLocation="Center" IsModal="True" CloseButtonVisibility="{Binding ErrorWindowCanExit}" SizeChanged="ChildWindowError_SizeChanged" 
                                     Loaded="ChildWindowError_Loaded" Closing="ChildWindowError_Closing">
                <ContentControl HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Content="{Binding ErrorContent}"/>
            </ExtendedToolkit:ChildWindow>
        </ExtendedToolkit:WindowContainer>

        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="35"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>

            <Grid Grid.Row="0" HorizontalAlignment="Stretch">
                <Border BorderBrush="Gray" BorderThickness="0,0,0,0.1">
                    <ContentControl Background="#FFF5F5F5">
                        <ToolBar Height="35" Background="Transparent" IsTabStop="False" ToolBarTray.IsLocked="True" Name="DionysusToolbar" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" 
                                 Loaded="DionysusToolbar_Loaded">
                            <ToolBar.Items>

                            </ToolBar.Items>
                        </ToolBar>

                    </ContentControl>
                </Border>
            </Grid>
            <Grid Grid.Row="1">
                <DockPanel LastChildFill="True">
                    <odc:OutlookBar IsTabStop="False" NavigationPaneText="Expand navigationbar to view" DockPanel.Dock="Left" x:Name="OutlookBar" Width="300" 
                                    AllowDrop="False" HorizontalContentAlignment="Left" IsButtonSplitterVisible="False" IsCloseButtonVisible="False" 
                                    IsManipulationEnabled="False" IsMaximized="True" IsOverflowVisible="False" ShowButtons="True" ShowSideButtons="True" Loaded="OutlookBar_Loaded" VerticalContentAlignment="Stretch" />
                    <ContentControl Content="{Binding MainContent}" Grid.Column="1"  Margin="0,0,2,0" Grid.Row="1"></ContentControl>
                </DockPanel>
            </Grid>
            <Border Grid.Row="2" BorderThickness="0,0.1,0,0" BorderBrush="Gray">
                <Grid Grid.Row="2">
                </Grid>
            </Border>
            <ContentControl Grid.RowSpan="3" Grid.ColumnSpan="2" HorizontalAlignment="Stretch" 
            VerticalAlignment="Stretch" 
            HorizontalContentAlignment="Stretch" 
            VerticalContentAlignment="Stretch">
            </ContentControl>

        </Grid>

    </Grid>

This way the window is shown behind my "MainContent" content control. If i do put the WindowContainer after the grid or topmost, I cannot access any of the other control.

As I mentioned this all was working perfectly until I updated to 2.0.