...set TListBox Items right aligned?

procedure TForm1.FormCreate(Sender: TObject);
begin
  // Oder im Objektinspektor einstellen
  // Or set in object inspector
  ListBox1.Style := lbOwnerDrawFixed;
end;

procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
var
  l: Integer; 
  t: String;
begin
  with ListBox1 do
  begin
    Canvas.FillRect(Rect);
    t := Items[Index]; 
    l := Rect.Right - Canvas.TextWidth(t) - 1;
    Canvas.TextOut(l, Rect.Top, t);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ListBox1.Items.Add(Edit1.Text);
end;

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