I am creating a form that I wish to force users to enter in the
information correctly.

I have added checkboxes for them to click when they have checked their
inputs however I have a problem whose answer eludes me.

I have a cell that is validated with an in-cell dropdown list. If this
= "Yes" the I want to force the next cell down to be greater than "1".
I have been told to use an event triggered by the clicking of the
checkbox to to validate this cell.

any help will be much appreciated.

B.