public static extern int ScrollWindowEx(IntPtr hwnd, int xAmount, int yAmount, IntPtr lpRect, ref Rectangle lpClipRect, IntPtr hrgnUpdate, out Rectangle prcUpdate, EScrollWindow flags);
public static extern int ScrollWindowEx(IntPtr hwnd, int xAmount, int yAmount, IntPtr lpRect, ref Rectangle lpClipRect, IntPtr hrgnUpdate, out Rectangle prcUpdate, EScrollWindow flags);