WPF: Drop shadow on borderless window without custom chrome

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.

Z开发者_如何学Goune 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>

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>

If you change ResizeMode to CanResize and set the ResizeBorderThickness to 0, you'll get a borderless window, which cannot be resized and the drop shadow can be clicked through so the window behind it activates.

<Window 
    .........
    .........
    .........
    Title="Welcome" Loaded="Window_Loaded" Height="400" Width="400" ResizeMode="NoResize" AllowsTransparency="True" WindowStyle="None" ShowInTaskbar="False" WindowStartupLocation="CenterScreen" Background="Transparent" BorderThickness="0">
<Border Margin="10" CornerRadius="100"
        BorderBrush="Black"
        BorderThickness="1"
        CornerRadius="10">
    <Border.Effect>
        <DropShadowEffect />
    </Border.Effect>

    <Grid> 
     ...
     ...//main design inside windows
     ...
    </Grid>
</Border>