final private function __setTreeData()
    {
        if ($this->tree) {
            // Include existing data with this Controller data
            $this->data = array_merge($this->incomingData['__store'], $this->data);
        }

        // Save updated data to $this->data['__store'] for next Controller
        $this->data['__store'] = array_merge($this->incomingData, $this->data);
    }