private CheckedTreeNode addToolNode(@NotNull CheckedTreeNode groupNode, @NotNull Tool tool) {
    CheckedTreeNode toolNode = new CheckedTreeNode(tool);
    toolNode.setChecked(tool.isEnabled());
    groupNode.add(toolNode);
    nodeWasInserted(toolNode);
    return toolNode;
  }
private CheckedTreeNode addToolNode(@NotNull CheckedTreeNode groupNode, @NotNull Tool tool)