Piwik\Widget\WidgetContainerConfig::setId PHP Method

    public function setId($id)
    {
        $this->id = $id;
        return $this;
    }

 /**
  * Creates a new container widget based on the specified report in {@link construct()}.
  *
  * It will automatically use the report's categoryId, subcategoryId (if specified) and order in order to
  * create the container.
  *
  * @param string $containerId eg 'Products' or 'Contents' see {Piwik\Widget\WidgetContainerConfig::setId()}.
  *                            Other reports or widgets will be able to add more widgets to this container.
  *                            This is useful when you want to show for example multiple related widgets
  *                            together.
  * @return WidgetContainerConfig
  */
 public function createContainerWidget($containerId)
 {
     $widget = new WidgetContainerConfig();
     $widget->setCategoryId($this->report->getCategoryId());
     $widget->setId($containerId);
     if ($this->report->getSubcategoryId()) {
         $widget->setSubcategoryId($this->report->getSubcategoryId());
     }
     $orderThatListsReportsAtTheEndOfEachCategory = 100 + $this->report->getOrder();
     $widget->setOrder($orderThatListsReportsAtTheEndOfEachCategory);
     return $widget;
 }