public @Nullable NamedConfigurable getSelectedConfigurable() {
    MyNode selectedNode = getSelectedNode();
    if (selectedNode != null) {
      final NamedConfigurable configurable = selectedNode.getConfigurable();
      LOG.assertTrue(configurable != null, "already disposed");
      return configurable;
    }
    return null;
  }
public @Nullable NamedConfigurable getSelectedConfigurable()