getCellValidator - How to validate and render a neighbour cell?

Hi,
I have 2 column having validator functions attached to them.
When first column is updated, I’d like to validate the second column as well, just to verify it is not empty.
I tried to use ‘afterValidate’ hook and inside call the ‘getCellValidator’ function of the relevant cell, but how do I provide it the callback parameter which eventually renders the cell?
Is this the right way to do this?
Thanks!
Udi

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