i'm trying to change the text color within my TListBoxItem

i'm trying to change the text color within my TListBoxItem and not working,,,

procedure TFGestaoInsp.Test;

var

  wItem       : TListBoxItem;

begin

    MyTListBox.BeginUpdate;

     MyTListBox.Items.Clear;

     wItem      := TListBoxItem.Create(MyTListBox);

     wItem.Text := 'Text with new color';

     wItem.FontColor := TAlphaColorRec.Green;

     wItem.ItemData.Detail := '....';

      wItem.StyleLookup := 'listboxitembottomdetail';

     MyTListBox.EndUpdate;

end;