@Override
  public void setAncestor(NodeDescriptor oldDescriptor) {
    super.setAncestor(oldDescriptor);
    myIsNew = false;
    if (!myValueReady) {
      ValueDescriptorImpl other = (ValueDescriptorImpl)oldDescriptor;
      if (other.myValueReady) {
        myValue = other.getValue();
        myValueReady = true;
      }
    }
  }
@Override
  public void setAncestor(NodeDescriptor oldDescriptor)