Native Aero Blur without Glass Effect on Borderless WPF Window

Question

I am aware that similar questions have been asked and answered. Mine, however, is a three-part question.

For the purposes of this question, keep the following in mind:

Answer 1

My Excuse

Pardon my inexperience with Stackoverflow but I thought I would try and help you out a little.

By following the link posted by Tom I was able to come across this block of code (originally in c#). So seen as how this code isn't readily availible to most people, here it is:

Imports System.Runtime.InteropServices
Imports System.Windows.Interop
'Import namespace ("name of project" . "name of namespace")
Imports Blurred_Opacity.BlurBehind

Namespace BlurTest
    Enum AccentState
        ACCENT_DISABLED = 0
        ACCENT_ENABLE_GRADIENT = 1
        ACCENT_ENABLE_TRANSPARENTGRADIENT = 2
        ACCENT_ENABLE_BLURBEHIND = 3
        ACCENT_INVALID_STATE = 4
    End Enum

    Structure AccentPolicy
        Public AccentState As AccentState
        Public AccentFlags As Integer
        Public GradientColor As Integer
        Public AnimationId As Integer
    End Structure

    Structure WindowCompositionAttributeData
        Public Attribute As WindowCompositionAttribute
        Public Data As IntPtr
        Public SizeOfData As Integer
    End Structure

    Enum WindowCompositionAttribute
        WCA_ACCENT_POLICY = 19
    End Enum
End Namespace

Class MainWindow
    
    Friend Shared Function SetWindowCompositionAttribute(hwnd As IntPtr, ByRef data As WindowCompositionAttributeData) As Integer
    End Function

    Sub Window_Loaded() handles me.loaded
        EnableBlur()
    End Sub
    Sub Window_MouseDown() handles me.MouseLeftButtonDown
        DragMove()
    End Sub

    Sub EnableBlur()
        Dim windowHelper = New WindowInteropHelper(Me)
        Dim accent = New AccentPolicy()
        accent.AccentState = AccentState.ACCENT_ENABLE_BLURBEHIND
        Dim accentStructSize = Marshal.SizeOf(accent)
        Dim accentPtr = Marshal.AllocHGlobal(accentStructSize)
        Marshal.StructureToPtr(accent, accentPtr, False)
        Dim Data = New WindowCompositionAttributeData()
        Data.Attribute = WindowCompositionAttribute.WCA_ACCENT_POLICY
        Data.SizeOfData = accentStructSize
        Data.Data = accentPtr
        SetWindowCompositionAttribute(windowHelper.Handle, Data)
        Marshal.FreeHGlobal(accentPtr)
    End Sub
End Class

Result

Once implemented, this will effect the whole Window as shown:

After a little tweaking

After about 5 mins of trying to copy your design I came up with this:

XAML

I'm sure you could do a better job of the design than I have. It is possible to change the blend colour simply by adjusting the background colour (on the window), and the opacity level can also be changed. The XAML of my design is as follows:

I hope this helps!