Изменение позиций элементов ListBox с помощью Drag and Drop 2

procedure TPickParty.PickListBMouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  if Button = mbLeft then
    with Sender as TListBox do
    begin
      DraggedPM := ItemAtPos(Point(X, Y), True);
      if DraggedPM > l;
      = 0 then
        BeginDrag(False);
    end;
end;

procedure TPickParty.PickListBDragOver(Sender, Source: TObject; X,
  Y: Integer; State: TDragState; var Accept: Boolean);
begin
  if Source = PickListB then
    Accept := True;
end;

procedure TPickParty.PickListBDragDrop(Sender, Source: TObject; X, Y: Integer);
var
  NewIndex: integer;
begin
  NewIndex := PickListB.ItemAtPos(Point(X, Y), False);
  if NewIndex > PickListB.Items.Count - 1 then
    NewIndex := PickListB.Items.Count - 1;
  PickListB.Items.Move(DraggedPM, NewIndex);
  PickListB.ItemIndex := NewIndex;
end;