This event occurs after insert, update, delete actions. It can be used to pass additional values to client side.

Example of usage:

      //adds new xml as a child of default <action> tag which is passed to client side as response
        function doAfterProcessing($action){
                   $action->set_response_xml("<guid>some value</guid>")
        }
        $gridConn->event->attach("afterProcessing",doAfterProcessing);