I wonder if it is possible to simulate the behaviour you want in this way:

have say 5 columns in the grid

1) a yes/no column A

2) a yes/no column B

3) a yes/no column C

4) a yes/no column D

5) a text column, that comines the results of columns 1-4 and outputs the results to your format.

Make columns 1-4 not visible in the grid, but show up in the edit dialog

Make column 5 visible in the grid, but now show up in the edit dialog

Then, when you save your data from the edit, set the data for column 5 to whatever you want the results of columns 1-4 to say.

I hope that makes sense and helps

Cheers,

Michael