ATTR_CALLBACK_DATA (Menu)
| Type: | Menu attribute |
| Description: | A pointer-width value that is passed to the menu or menu item callback function. The value can be a pointer to user data. |
| Menu Objects: | Menus, submenus, menu Items. |
| Data Type: | pointer |
| Default Value: | NULL |
| LabWindows/CVI Compatibility: |
LabWindows/CVI 3.0 and later |