WPF——WebBroswer无法显示问题

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在WPF中Window里面放置WebBroswer控件居然无法显示：
源代码如下：
[html]
<Window x:Class="MutilScreenDemo.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"
        Title="MainWindow"
        AllowsTransparency="True"
        Background="Black"
        BorderBrush="Transparent"
        BorderThickness="0"
        d:DesignHeight="348"
        d:DesignWidth="892"
        Loaded="Window_Loaded"
        ResizeMode="NoResize"
        WindowStyle="None"
        mc:Ignorable="d">

    <Grid x:Name="layoutRoot">
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Rectangle Height="2"
                   VerticalAlignment="Bottom"
                   Fill="White" />
        <TextBlock Name="txtShow"
                   Grid.Row="0"
                   HorizontalAlignment="Left"
                   VerticalAlignment="Center"
                   FontSize="50"
                   FontWeight="Bold"
                   Foreground="Red"
                   Text="Hello World!" />
        <StackPanel Grid.Row="0"
                    HorizontalAlignment="Right"
                    VerticalAlignment="Center"
                    Orientation="Horizontal">
            <Button Name="button1"
                    Margin="5"
                    HorizontalAlignment="Right"
                    VerticalAlignment="Top"
                    Click="button1_Click"
                    Content="Get Screen Info"
                    Padding="20" />
            <Button Name="btnShutdown"
                    Margin="5"
                    HorizontalAlignment="Right"
                    VerticalAlignment="Top"
                    Click="btnShutdown_Click"
                    Content="ShutDown App"
                    Padding="20" />
        </StackPanel>
[html]

[html]
    <WebBrowser Name="broswer"
                Grid.Row="1"/>
</Grid>
/Window>

显示效果：

经过折腾和尝试，问题出在Window里面的AllowsTransparency属性，WebBroswer控件显示和AllowsTransparency为True时产生冲突。
去掉AllowsTransparency后显示效果如下：

但是具体问什么会这样，我没搞清楚。希望有大神指点一二！！

补充：Web开发 , ASP.Net ,