Window “on desktop”

using System;
    using System.Runtime.InteropServices;
    using System.Windows;
    using System.Windows.Interop;

[DllImport("user32.dll")]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X,
   int Y, int cx, int cy, uint uFlags);

const UInt32 SWP_NOSIZE = 0x0001;
const UInt32 SWP_NOMOVE = 0x0002;
const UInt32 SWP_NOACTIVATE = 0x0010;

static readonly IntPtr HWND_BOTTOM = new IntPtr(1);

public static void SetBottom(Window window)
{
    IntPtr hWnd = new WindowInteropHelper(window).Handle;
    SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
}

[DllImport("user32.dll")]
static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

public static void SetOnDesktop(Window window)
{
    IntPtr hWnd = new WindowInteropHelper(window).Handle;
    IntPtr hWndProgMan = FindWindow("Progman", "Program Manager");
    SetParent(hWnd, hWndProgMan);
}