private void butDelete_Click(object sender, EventArgs e)
 {
     if (_evalCritDef.IsNew)
     {
         DialogResult = DialogResult.Cancel;
         return;
     }
     if (MsgBox.Show(this, MsgBoxButtons.YesNo, "This will delete the criterion def.  Continue?"))
     {
         EvaluationCriterionDefs.Delete(_evalCritDef.EvaluationCriterionDefNum);
     }
     DialogResult = DialogResult.OK;
 }