private CheckedTreeNode insertNewTool(final CheckedTreeNode groupNode, final Tool toolCopy) {
   CheckedTreeNode toolNode = new CheckedTreeNode(toolCopy);
   toolNode.setChecked(toolCopy.isEnabled());
   ((ToolsGroup) groupNode.getUserObject()).addElement(toolCopy);
   groupNode.add(toolNode);
   nodeWasInserted(toolNode);
   return toolNode;
 }