Hello comunity

I have a grid with unique index per row, and in that grid i have also one column where i need to write one numeric value that represent the amount not financed by the bank , for example:

index data document original value not financed
123 01-01-2009 invoice1 1000€ 1000€
456 10-01-2009 invoice2 1500€ XX

What i need is to keep in memory the row where i changed the value of "not financed" (XX) and also index ,data, original value and not financed value.

i need this information because when i click on save button on this this form, i open an another one to fill the above information.
the problem is when i click on SAVE the cursor on grid go to top and i loose this information and i don´t know how to preserve all fields value in memory where the content of my column "not financed" as be modified.

Could someone give me an ideia

Many thanks
Luis Santos