Keydown into Table Fields

[Josep M Yepes]

Hello,

I need to control thekey pressed into the cell in a Table field.

I have this code:

on keydown thekey
   if thekey is "F4" then go to card "s_itemSelect"
   else pass keydown
   --asnwer "thekey"
end keydown

The objective is when the user press F4 one card with a list of items  
is showed to select one of them.

Is posible to difference between columns into the Table Field, to  
select different actions with the same F4 key.
I think that controlling the x,y of the cell can be one way, but I  
don't know if exist someway more effective.

But, nothing happen.
Sure that I doing something wrong but I don't see what it's.

Thanks,
Josep