private void initialize() {
final RouteConverter r = RouteConverter.getInstance();
formatAndRoutesModel = new UndoFormatAndRoutesModel(r.getContext().getUndoManager());
positionsSelectionModel = new PositionsSelectionModel() {
public void setSelectedPositions(int[] selectedPositions, boolean replaceSelection) {
if (replaceSelection) {
ListSelectionModel selectionModel = tablePositions.getSelectionModel();
selectionModel.clearSelection();
}