Category Field in Address Book

Would it be possible to sort the addresses in each category? At presetn they are in the order they were entered but could they be sorted into alphabetical order.

Right-click in menu select "Arrange Icons By" and select Auto arrange or just click "Display Name".

If you have too many categories then depending of TLB version you can:
version < 4.2.6:
Right-click the menu with categories and select "Customize menu...". Select the submenu options and select the arrange options

version 4.2.6
Right-click the menu with categories and select "Customize Sub-menus...". Select the arrange options.