docs: private static Widget findChildByNameInOneGroup(final String name,
                                                      final Widget groupWidget, ArrayList<Widget> groupChildren) {
          Collection<Widget> children = groupWidget.getChildren();
          for (Widget child : children) {
              if (child.getName() != null && child.getName().equals(name)) {
                  return child;
              }
              if (child instanceof GroupWidget) {
                  // Save the child for the next level of search if needed.
                  groupChildren.add(child);
              }
          }
          return null;
      }