Adding callback function on edit

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What steps will reproduce the problem?
1. make editable a datatable
2. specify parameter "aoColumns"
3. use callback parameter in a column (like in jeditable page)

What is the expected output? What do you see instead?
The callback parameter should return value and settings vars, but it doesn´t 
works

What version of the product are you using? On what operating system?
The last one, recently download :). Windows Vista SO

Please provide any additional information below.

i don´t know if is an error or there is a reason to avoid the use of 
"callback" in a specify column.

Original issue reported on code.google.com by vvcor...@gmail.com on 9 Jun 2011 at 10:36