public extern static bool GetScrollRange(IntPtr hWnd, WhichScrollBar nBar, out short nMinPos, out short nMaxPos);
public extern static short GetScrollPos(IntPtr hWnd, WhichScrollBar nBar);
public extern static bool SetScrollRange(IntPtr hWnd, WhichScrollBar nBar, short nMinPos, short nMaxPos, bool fRedraw);
public extern static short SetScrollPos(IntPtr hWnd, WhichScrollBar nBar, short nPos, bool fRedraw);