/** * Starts viewstate tracking if necessary after when controls has been loaded */ public function onLoad($param) { if ($this->getIsTrackingPageState()) { $stateTrackerClass = $this->_stateTrackerClass; $this->_stateTracker = new $stateTrackerClass($this->getControl()); $this->_stateTracker->trackChanges(); } parent::onLoad($param); }