efl/src/lib/elementary/elm_popup_part.eo

class Elm.Popup.Part (Efl.Ui.Layout.Part_Legacy)
{
   [[Elementary popup internal part class]]
   data: null;
   implements {
      Efl.Container.content { get; set; }
      Efl.Container.content_unset;
      Efl.Text.text { set; get; }
   }
}