How to get handle to a MST bean for a particular row in an advanced table

Hi
Requirement:
My advanced table has 2 columns, the 1st one has a LOV and the 2nd one is a switcher which toggles from LOV to MST depending on the value in the 1st column.
Implementation Steps:
1) Trap LOV event in 1st column and pass row index to the AM
2) Get the VO row from the row index (EVENT_SOURCE_ROW_REFERENCE), set the switcher attribute to MST/LOV depending on Business Logic
3) Get the view attribute value of the 2nd column (to which LOV/MST is mapped).
My LOV/MST gets rendered correctly on the page. However, when the LOV renders in the 2nd column, the view attribute is correctly populated in the LOV. But the MST renders with no value.
I understand that the MST loses value on form submission and that this value needs to be set in the PR of the CO. For that how do I get a handle to the MST bean of the particular row?
This is urgent!!
Thanks
Ritu

Pointers?
Anyway I can make the MST in the row return the correct view attribute?

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