Actually, the background of the row is changed but the validation border is over it so you do not achieve the behavior you seek for. The red validation border is applied through a Storyboard which can be found in the Control Template of the GridViewRow. With this in mind, you need to edit the control template
of the GridViewRow and apply the changes there. You can investigate the control template of the row and work with the visibility of the Background_Invalid border to achieve the desired behavior.
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