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The LayoutAnchorable Can Not Show When It Is In LayoutRoot's Sides

Jun 18, 2014 at 11:39 AM
Under is My Xaml Code, The LayoutAnchorable which named "L" can't not show its' content. As I Know it is because the Window's property AllowsTransparency being set as "True". But I have seen some project did so without any error. How to solve this ?
<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:avalondock="http://schemas.xceed.com/wpf/xaml/avalondock"
        Title="MainWindow"  AllowsTransparency="True">
<Grid>
<avalondock:DockingManager Grid.Row="1" x:Name="DockManager">
      <avalondock:LayoutRoot>
                <avalondock:LayoutPanel>
                    <avalondock:LayoutDocumentPaneGroup
                                     x:Name="LDG" Orientation="Horizontal">
                        <avalondock:LayoutDocumentPane DockMinWidth="280" 
                                                                                  DockMinHeight="200"/>
                    </avalondock:LayoutDocumentPaneGroup>
                </avalondock:LayoutPanel>
                <avalondock:LayoutRoot.BottomSide>
                    <avalondock:LayoutAnchorSide>
                        <avalondock:LayoutAnchorGroup>
                            <avalondock:LayoutAnchorable x:Name="L" Title="It Can't Be See!" ContentId="a">
                                <Border Height="300"></Border>
                            </avalondock:LayoutAnchorable>
                        </avalondock:LayoutAnchorGroup>
                    </avalondock:LayoutAnchorSide>
                </avalondock:LayoutRoot.BottomSide>
            </avalondock:LayoutRoot>
</avalondock:DockingManager>
</Grid>
</Window>