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dynamically populate combo in grid

I have a specific need to dynamically populate combo ONLY if the user selects a radio button.

Details -
The column types for each row looks like this -
mygrid.setColTypes("ro,ed,ed,ra_str,ra_str,ra_str,co");

I am populating the grid values from an array like this - mygrid.parse(array1, "jsarray");

Now when the user clicks the second radio, i would like to dynamically populate the last column which is of type combo. Can this be done? If yes, how?

Thanks,
Ram