public static void EnableBlurBehindWindow(IntPtr hwnd)
{
DWM_BLURBEHIND dbb;
dbb.fEnable = true;
dbb.dwFlags = Constants.DWM_BB_BLURREGION | Constants.DWM_BB_ENABLE;
dbb.hRgnBlur = IntPtr.Zero;
dbb.fTransitionOnMaximized = false;
WinAPI.DwmEnableBlurBehindWindow(hwnd, ref dbb);
}