Scrolling TMemo and TRichEdit control at runtime

Here is the code to scroll TMemo control to bottom at runtime:

var M: TWMVScroll;
begin
 M.Msg := WM_VSCROLL;
 M.ScrollCode := SB_BOTTOM;
 Memo1.Dispatch(M);
end;

As such, we may use the code above to perform various kind scrolling operation during runtime:

{ Scroll Bar Commands }
{$EXTERNALSYM SB_LINEUP}
SB_LINEUP = 0;
{$EXTERNALSYM SB_LINELEFT}
SB_LINELEFT = 0;
{$EXTERNALSYM SB_LINEDOWN}
SB_LINEDOWN = 1;
{$EXTERNALSYM SB_LINERIGHT}
SB_LINERIGHT = 1;
{$EXTERNALSYM SB_PAGEUP}
SB_PAGEUP = 2;
{$EXTERNALSYM SB_PAGELEFT}
SB_PAGELEFT = 2;
{$EXTERNALSYM SB_PAGEDOWN}
SB_PAGEDOWN = 3;
{$EXTERNALSYM SB_PAGERIGHT}
SB_PAGERIGHT = 3;
{$EXTERNALSYM SB_THUMBPOSITION}
SB_THUMBPOSITION = 4;
{$EXTERNALSYM SB_THUMBTRACK}
SB_THUMBTRACK = 5;
{$EXTERNALSYM SB_TOP}
SB_TOP = 6;
{$EXTERNALSYM SB_LEFT}
SB_LEFT = 6;
{$EXTERNALSYM SB_BOTTOM}
SB_BOTTOM = 7;
{$EXTERNALSYM SB_RIGHT}
SB_RIGHT = 7;
{$EXTERNALSYM SB_ENDSCROLL}
SB_ENDSCROLL = 8;