forceFocus();
boolean onPageTraversal(Event event) {	int count = items.length;	if (count == 0) return false;	int index = selectedIndex; 	if (index  == -1) {		index = 0;	} else {		int offset = (event.detail == SWT.TRAVERSE_PAGE_NEXT) ? 1 : -1;		index = (selectedIndex + offset + count) % count;	}	setSelection (index, true);	forceFocus();	return true;}