how to setfont of Detailtext in Swt.Mobile.ListBox?(ListBox's detailtext)

[yatinindianic]

my code is like that
listBox = new ListBox(current Shell, SWT.SINGLE | SWT.V_SCROLL,
ListBox.LB_STYL E_NO_HEADING_TE XT | ListBox.LB_MOD_ SHOW_DETAIL_ICO NS);

font23 = new Font(currentShe ll.getDisplay() , "sansserif" , 35, SWT.ITALIC);
listBox.setFont (font23);


it is not working ,please reply me