I found the answer on the Autodesk discussion groups site.:
To edit the POP0 menu, do the following:
1. CUI to launch the Customize User Interface dialog
2. In the tree view (on the left) expand Shortcut Menus
3. Expand Object Snap Cursor Menu (note POP0 alias is displayed in properties).
Submitted by Christopher Miller \(Autodesk, Inc.\)
and then this in addition ...
The CUI dialog has the ability to search cui/menu elements.
- cui
- Right Click anywhere in treeview and choose "Find.."
- Enter POP0
- It should bring you to first occurance of cui elements that has POP0 string.
Submitted by Tekno Tandean [Autodesk, Inc.]