I www.jamesbarnsley.com was tasked to find a way to do recursive deletion in Yii. As I asked other developers and looked around the internet the usual answers all came up, use a plugin or use cascade delete at the DB level, but I did not want to do either of these.
I (www.jamesbarnsley.com) found that when using the Yii Bootstrap tabs component you will sometimes want to direct the user to a specific tab and not necessarily the first tab. Yii Bootstrap already provides the "active" variable so you can define whether the tab is the active tab or not in PHP. I generally find though that a PHP solution to this problem is rather cumbersome as every tab component will need the PHP code inserted or you will have to extend the tab component somehow to do it.
You have that, when a product is on development they can change its API anytime. This change is quite important though, its related on how to set the events of your form, for example, the useful beforeSubmit.
As written on the API docs: An Action Provider Widget is a widget that has declared several actions by using its 'public static function actions()'. After, a Controller can easily import all its declared actions on its 'public function actions()'.