Hi Roger,
I use 2 tables to achieve:(1) To lock table 1 as the heading columns and table 
2 to be data columns.(2) To allow the calculation a bit more easier.  As my 
program has spreadsheet style formula in each cell and the calculation scope is 
limited to table 2.(3) And all the interface components available for editing 
are used only in table 2.
I think it is possible to only use one table but not very complex.
What do you recommend?
Thanks for your concerns!
Brendan                                           

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