public function addToContainerWidget($containerId, WidgetConfig $widget)
    {
        if (isset($this->container[$containerId])) {
            $this->container[$containerId]->addWidgetConfig($widget);
        } else {
            if (!isset($this->containerWidgets[$containerId])) {
                $this->containerWidgets[$containerId] = array();
            }

            $this->containerWidgets[$containerId][] = $widget;
        }
    }