Java Development Tools

Hi All,

I was playing around with dynamic default values using groovy and it all works great but what I was wondering is if I can trigger the calculation of the default value whenever I want ?
Currently it seems as though the default value is only triggered at the create new row operation.

Here's my use case:
I want a default value to be determined by another value entered on the screen but both fields start off empty when creating a new row. I want the default value to be evaluated after the user enters the first field.

Is there any way to do this easily ?
Maybe I'm missing something.

Thanks,
Mark