CFGRID onValidate

I am using cfgrid and MX7 (not Flash Forms). I'm trying to create a JavaScript client-side validation of a single grid column in order to verify that the cell has been filled out and is a valid date.

My major issue is trying to access each cell in the column to get their value. I need to validate these cells whether they have or have not been updated.

Any help is greatly appreciated.

Jennifer