private void expandTree() {
    TreeNode rootNode = myModel.getRoot();
    if (rootNode == null) return;

    MyProjectStructure treeStructure = myModel.getTreeStructure();
    Object element = treeStructure.getRootElement();
    myModel.expand(element, myTree, path -> {
    });
    for (Object childElement : treeStructure.getChildElements(element)) {
      myModel.expand(childElement, myTree, path -> {
      });
    }

    myTree.setSelectionPath(new TreePath(rootNode));
    myTree.scrollRectToVisible(new Rectangle(new Point(0, 0)));
  }
private void expandTree()