Radio Button to update various table calculations

I am trying to use LiveCycle 8 and find a way to update the various calculations in each row contained in a very large table. I am using formcalc. The calculations in various cells need to be changed based on a user’s radio button selection.
 
As an example, I have a table with 5 rows and 5 columns. The 5th row contains a grand total of all the values contained in the above columns.
 
The table looks like this:
 
Cell1, Cell2, Cell3, Cell4, Cell5
Cell1, Cell2, Cell3, Cell4, Cell5
Cell1, Cell2, Cell3, Cell4, Cell5
Cell1, Cell2, Cell3, Cell4, Cell5
Total1, Total2, Total3, Total4, Total5
***all are numeric fields
 
The script on the radio button applied on change is as follows:
 
Button 1-
form1.#subform[0].Table1.*.Cell1.calculate = SUM(Cell2 + Cell3)
 
Button 2-
form1.#subform[0].Table1.*.Cell1.calculate = SUM(Cell4 + Cell5)
 
If I apply SUM (Cell4 + Cell5) or SUM (Cell2 + Cell3) manually as calculate scripts the formulas work fine.
 
When I try and update the calculations of all instances of ‘Cell1’ using the radio button I get “Accessor ‘Cell2’ is unknown”.
 
Any help would be appreciated.
 
Thanks
 
Chris