There are two types of sorting available by default in Administration generator (CRUD):

• Pointers
• Numbers

To enable this functionality you need to specify these options for area class:

• sortable - (bool) does the user has a right to change the order of the records
• sortType - (string) sorting type ('pointers' or 'numbers')
• sortField - (string) integer field in database to store sorting data. Default value - 'row_number'
• newRecordPosition - (string) specifies the position where new records should be placed upon other records. Available values: null, 'top', 'bottom'. Defaults to 'bottom'.

Download the example and see how these options are used. Pay attention to items_area.php file. Other files are unchanged from AddressBook example plugin.