for (int i = 0; i < size(); i++) {
final JComponent component = (JComponent) get(i);
if (component == null) continue;
component.setTransferHandler(new SimpleTransferHandler(options) {
/** */
private static final long serialVersionUID = 1L;
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public void files(List<File> files) {