-3 => Menu ID requested is not in Stack Resources File .
 0 => no selection was made by the user.
Otherwise PopMenuBar returns the ID of the Menu and the item number of the selection made by the user. Example: "301,2" indicates that the user selected item #2 in Menu ID 301.
Comments:
- Keyboard equivalents for the menu items are not displayed because they have no use in Pop Up Menus.
- PopUpMenu limits drawing of the Pop Up menus to the Card Rectangle.
- Suggestion about improvements are welcome.
- Menu resources can easily be created with our XFCN MakeMenu or using ResEdit .