And, users can add, edit or delete attributes by the mz_dupAttrUI.
Instruction:
1. put it on your Maya script folder.
...Documents and Settings\user name\My Documents\maya\2011\scripts
2. run Maya.
3. type "source MZ_dupAttr.mel; mzDupAttrUI;" in your maya script editor window or the command line.
4. hold middle mouse button and drag the "source MZ_dupAttr.mel; mzDupAttrUI;" to your maya shelf. so, you can use this script repeatedly.
Please use the Bug System to report any bugs.
Please use the Feature Requests to give me ideas.
Please use the Support Forum if you have any questions or problems.
Please rate and review in the Review section.
Please use the Feature Requests to give me ideas.
Please use the Support Forum if you have any questions or problems.
Please rate and review in the Review section.

