public function dispatch($name, AbstractCallback $callback, Model $model = null)
    {
        if (isset($this->register[$name]) === false) {
            // No registered handler. Early return.
            return '';
        }

        $output = '';

        // Got to handel them all.
        foreach ($this->register[$name] as $classname) {
            $output .= $this->pool->createClass($classname)->handle($callback, $model);
        }

        return $output;
    }