Display Question - Summary Field?

[rsglewin]

Hi,

I have a global Summary Field displaying a time total that calculates correctly. However, the field displays nothing while I am modifying any of the fields it totals - once I am done, the display shows up again with the modified total. What I would like is for the old total to remain while I am modifying the source fields and have the new total appear once I am finished. I have tried other methods of making this work, but I can't seem to get both the global and the calculation parts correct.

Is there a better way to do this, or is there perhaps a way to change the behavior of the summary field?

Thanks!