code: public static void iterateChildren (@Nonnull final IHCNode aNode, @Nonnull final IHCIteratorCallback aCallback)
    {
      ValueEnforcer.notNull (aNode, "node");
      ValueEnforcer.notNull (aCallback, "callback");
  
      _recursiveIterateTreeBreakable (aNode, aCallback);
    }
docs: Recursively iterate all child nodes of the passed node.
  
  @param aNode
  The node who's children should be iterated.
  @param aCallback
  The callback to be invoked on every child