I've done something like this before. It will depend upon how many rows you are 
talking about. It goes like this:

1. Create a composite cell which contains the n different single selection 
cells you will need.
2. Populate them with their options when you build the cells columns , as you 
would normally.
3. Add a flag to the model data structure you are using to tell the column 
which selection cell to render.

HTH

Jaga.

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