This method sets the current position of a scroll box and, optionally, redraws the scroll bar to reflect the new position of the scroll box.
Setting bRedraw to FALSE is useful whenever the scroll bar will be redrawn by a subsequent call to another function.
BOOL bRedraw = TRUE );
Specifies the scroll bar to be set. This parameter can be either of the following:
SB_HORZ Sets the position of the scroll box in the horizontal scroll bar of the window.
SB_VERT Sets the position of the scroll box in the vertical scroll bar of the window.
Specifies the new position of the scroll box. It must be within the scrolling range.
Specifies whether the scroll bar should be repainted to reflect the new scroll-box position. If this parameter is TRUE, the scroll bar is repainted; if FALSE, the scroll bar is not repainted.