A bug with RecursiveIteratorIterator?

I'm trying to extend the RecursiveIteratorIterator class, to limit which children it recurses through. The documentation here: http://www.php.net/~helly/php/ext/spl/classRecursiveIteratorIterator.html says that there is a ahapublic method callHasChildren(), which I figured was a good place to start. It seemed like it made sense, except for the fact that that callHasChildren() does not exist. Overloading the function does nothing, and instantiating my extended object, then manually calling callHasChildren() results in a method not found error. Call to undefined method RecursiveIteratorIterator::callhaschildren() I'm including my complete extension class below Thanks, Chris class CPage_TreeMenuIterator extends RecursiveIteratorIterator { function __construct(CPage_Node $it) { parent::__construct($it,RIT_SELF_FIRST); } function callHasChildren() { echo "CPage_TreeMenuIterator::callHasChildren();<br />\n"; return parent::callHasChildren(); } }