internal static extern int GetClipBox(IntPtr hDC, ref RECT rectBox);
internal static extern IntPtr CreateRectRgnIndirect(ref RECT rect);
internal static extern bool DrawFocusRect(IntPtr hWnd, ref RECT rect);
internal static extern bool InvalidateRect(IntPtr hWnd, ref RECT rect, bool erase);
internal static extern bool GetWindowRect(IntPtr hWnd, ref RECT rect);