void incrementSelection(int increment) {
final void incrementSelection(int increment) {
    void incrementSelection(int increment) {        int selected = popupList.getSelectedIndex();        selected += increment;        int size = getListSize();        if (selected >= size) {            selected = size - 1;        } else if (selected < 0) {            selected = 0;        } else if (getFocusOwner() == popupList) {            return;        }        popupList.setSelectedIndex(selected);        popupList.ensureIndexIsVisible(selected);    }