public static bool ExtendGlass(Window win, int left, int right, int top, int bottom) { try { if (!DwmIsCompositionEnabled()) { return(false); } // Obtain the window handle for WPF application WindowInteropHelper windowInterop = new WindowInteropHelper(win); IntPtr windowHandle = windowInterop.Handle; HwndSource mainWindowSrc = HwndSource.FromHwnd(windowHandle); mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent; VistaGlassHelper.Margins margins = VistaGlassHelper.GetDpiAdjustedMargins(windowHandle, left, right, top, bottom); int returnVal = VistaGlassHelper.DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins); if (returnVal < 0) { throw new NotSupportedException("Operation failed."); } return(true); } catch { return(false); } }