Création d'un ScrollBar

ListBox1.Perform(WM_VScroll, SB_LINEUP, 0);

ListBox1.Perform(WM_VScroll, SB_LINEDOWN, 0);

  { 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;