* Action, to add tablenav elements
* @since 1.0.0
* @param (string)     $which     'top’ or 'bottom’

The tickets overview is an extension of WP_List_Table. On the top and bottom you will find the possibility to change the displayed tickets. You can choose, if you want to see all tickets or just tickets of a certain status. With this action, you can create your own HTML elements in this region and by doing so extending the tables functionality.