nSBCode value for ScrollBar Control

SB_UP -- Scroll far to up.
SB_DOWN -- Scroll far to down.
SB_LINEUP -- Scroll to Upper side.
SB_LINEDOWN -- scroll to down side.
SB_LEFT -- Scroll far to left.
SB_RIGHT -- Scroll far to right.
SB_ENDSCROLL -- End scroll.
SB_LINELEFT -- Scroll left.
SB_LINERIGHT -- Scroll right.
SB_PAGELEFT -- Scroll one page left.
SB_PAGERIGHT -- Scroll one page right
SB_THUMBTRACK --
Drag scroll box to specified position.
nPos is the position that the scroll box has been dragged to.
SB_THUMBPOSITION --
Scroll to absolute position. nPos is the position of the
scroll box at the end of the drag operation.