@Override
  public void adoptElement(SceneElement elem) {
    if (!(elem instanceof NenyaImageSceneElement
        || elem instanceof NenyaTileSceneElement
        || elem instanceof NenyaComponentSceneElement)) {
      enableEditor(false);
      return;
    }

    DefaultComboBoxModel dcm = (DefaultComboBoxModel) itemList.getModel();

    // Important: Work on a copy, not on the original. Otherwise we mess up the undomanager
    sceneElement = elem.copy();

    if ((sceneElement instanceof NenyaImageSceneElement) && !locked) {
      dcm.removeAllElements();
      String[] tmp = ((NenyaImageSceneElement) sceneElement).getPath();
      dcm.addElement(tmp[tmp.length - 1]);
    }
    if ((sceneElement instanceof NenyaTileSceneElement) && !locked) {
      dcm.removeAllElements();
      dcm.addElement(((NenyaTileSceneElement) sceneElement).getTileName());
    }
    if ((sceneElement instanceof NenyaComponentSceneElement) && !locked) {
      dcm.removeAllElements();
      NenyaComponentItem[] ni = ((NenyaComponentSceneElement) sceneElement).getComponents();
      for (NenyaComponentItem element : ni) {
        dcm.addElement(element);
      }
    }

    try {
      ClassedItem[] cols = null;
      if (elem instanceof NenyaTileSceneElement)
        cols = ((NenyaTileSceneElement) elem).getColorList();
      if (elem instanceof NenyaImageSceneElement)
        cols = ((NenyaImageSceneElement) elem).getColorList();
      if (elem instanceof NenyaComponentSceneElement) {
        NenyaComponentItem nci = (NenyaComponentItem) dcm.getSelectedItem();
        cols = nci.getColorList();
      }
      Vector<TreePath> collect = new Vector<TreePath>();
      TreeNode root = (TreeNode) colors.getModel().getRoot();
      for (ClassedItem col : cols) {
        String[] tmp = {root.toString(), col.getClassName(), col.getItemName()};
        collect.add(TreeUtil.findPath(root, tmp));
      }
      TreePath[] path = collect.toArray(new TreePath[0]);
      colors.getSelectionModel().setSelectionPaths(path);
    } catch (Exception e) {
      // Either the tree is filtered away or the selected item is not colorized.
    }

    enableEditor(true);
    itemList.setEnabled(elem instanceof NenyaComponentSceneElement);
  }
 public void treeExpanded(TreeExpansionEvent event) {
   TreePath treePath = event.getPath();
   if (treePath != null) {
     TreeUINode targetNode = (TreeUINode) treePath.getLastPathComponent();
     if (!targetNode.isChildrenLoaded()) {
       String targetPathText = TreeUtil.makePathText(treePath);
       String absPathText = PathUtil.makeChildPath(_tree.getRelativeRoot(), targetPathText);
       expandNode(targetNode, absPathText);
     }
   }
 }