| actionName | Name of the item. This name will be displayed in the drop-down menu. |
| action | Callback to execute when the user selects this item in the menu. |
| actionStatusCallback | Callback to execute to determine the status of the item. |
| atIndex | Index where the item should be inserted. |
| userData | An object that will be stored in the userData property of the MenuAction item. This object is accessible through the action callback. |
Add an item that will execute an action in the drop-down menu. The item is added at the end of the specified index in the list.