Multiselect stopped working after small change to the VO.

Hi,
I have a UI page where i need to make a small modification to the EO and the VO. There is a table which has multi select enabled. The multi select is bases on a transient variable in the VO with update able = always. This is working fine initially.
Now i need to modify the EO's primary key. Currently is is made of col a+ col b and i need to make it col1 + col c. After doing this i edit the VO and uncheck the Primary_Key property of the Col b to null. I check the attribute mapping. Everything looks fine. When i run the AM in test mode , i see all values are correctly mapped to the corresponding columns.
Now , strangely when i run the UI page, the VO changes are reflecting but the multiselect has stopped working. When i put a breakpoint on the Set method of IsSelected . .. i find that it is not being called at all.
I am not able to figure out what the problem is.. Any inputs on this would be very helpful .
Thanks,
Ankit

Sumit,
Why do i need to re create the EO since the transient variable is present in the VO and the get set methods are present only in the VO java file. As far as i feel there should be no co-relation between the multi select attribute and the EO.
If you are asking me to do the same from the perspective of the primary key, then after modifying the primary key, everything is working fine as per the required functionality other than the multiselect. Since i have implemented it in many of my UI pages i think i am not doing anything different here.. Just that when i modify the primary key of the VO, the setter method of the multi select attr is not called.

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