how can show medium text in listbox

Hi everybody.

i can show in data source medium text for an infoobject;

its ok. but medium text and short texf different.

so for listbox component items

on startup ;

LISTBOX_1.setItems(DS_1.getMemberList("0HE_STORGP", MemberPresentation.EXTERNAL_KEY, MemberDisplay.TEXT, 20));

memberDisplay.TEXT gives me short text. no option for medium text. how can i show medium text?