@Override
public void valueChanged(MapEvent<String, Integer> e) {
int index = types.indexOf(e.getKey());
nodeChanged(getChildAt(index));
}
@Override
public void keyRemoved(MapEvent<String, Integer> e) {
int index = types.indexOf(e.getKey());
types.remove(index);
removeNodeFromParent((MutableTreeNode) getChildAt(index));
}