WPF: Drop shadow on borderless window without custom chrome

Question

Im struggling with drop shadow on WPF-windows with WindowStyle=None and ResizeMode=NoResize. Is there any good alternative to using a DropShadow-effect on the window-content? I have tried WindowChrome in Shell Integration Library but its not showing any "Chrome" when ResizeMode=NoResize.

If it was possible somehow to draw a wpf-drop-shadow outside my window borders it could be a solution. If Im drawing the drop shadow inside the window I get a different behaviour then standard when for instance moving the mouse-cursor over the shadow. There should be no hit testing in my window when doing this and clicking this area should activate the window behind etc.

Zune seem to be drawing its own drop shadow because its not looking exactly like the standard Chrome-shadow. But its behaving like a normal drop shadow in that way its not capturing mouse events. I wonder how they do it.

Spotify also has another kind of shadow which is also not capturing mouse events.

I guess these apps draw their own WindowChrome completely, but how? Is this supported in WPF somehow?

<Window x:Class="ShellIntegrationTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:shell="clr-namespace:Microsoft.Windows.Shell;assembly=Microsoft.Windows.Shell"
        Title="MainWindow" Height="512" Width="384" WindowStyle="None" ResizeMode="NoResize">
  <shell:WindowChrome.WindowChrome>
    <shell:WindowChrome ResizeBorderThickness="5" GlassFrameThickness="-1" CornerRadius="0" CaptionHeight="25" />
  </shell:WindowChrome.WindowChrome>
</Window>

Answer 1

This code will work on a borderless window to show the shadow if the window is set to not resize and it's style is none.

    xmlns:local="clr-namespace:BorderTest" 
    mc:Ignorable="d" WindowStyle="None" ResizeMode="NoResize"
   Title="MainWindow" Height="350" Width="525" AllowsTransparency="True" Background="Transparent">
<Border Margin="10" BorderThickness="1" BorderBrush="Blue">
    <Border.Effect>
        <DropShadowEffect Color="Black"
                          Direction="270"
                          BlurRadius="10"
                          ShadowDepth="3" />
    </Border.Effect>
    <Grid Background="White">

    </Grid>
</Border>