title: Make a second drop down required if the first drop down matches a specific value?
body: <p>I have a column that in every cell there is a expanded list of names.<br>
  If a certain value, for example, </p>
  
  <blockquote>
    <p>Mario</p>
  </blockquote>
  
  <p>is selected from the list, then require entry of the values available in the drop down in the second column. If a different value is in the first drop down, then the second drop down is not required.</p>