As a followup to the question linked below, how would I cause an error message to be displayed on the grid for a dependent column. In the question from yesterday I was able to see that a row was dirty, but need a particular column (Comments) to be required if the row has been modified. The question is how would I get the validation message to show up for the Comments field?
ColA ColB ColC Comments
If A,B,C is modified and the row becomes dirty, I would like the validation message to show up when the user clicks "Save Changes" on the toolbar if the Comments field is empty.