//Type a value in cell 1,1
FarPoint.Win.Spread.TipNotify tnote = new FarPoint.Win.Spread.TipNotify();
tnote.ToolTipText = "Greater than 5";
tnote.ToolTipTitle = "Error";
tnote.ToolTipIcon = ToolTipIcon.Error;
FarPoint.Win.Spread.CompareValueValidator compare = new FarPoint.Win.Spread.CompareValueValidator();
compare.ComparedOperator = FarPoint.Win.Spread.ValidateComparisonOperator.GreaterThan;
compare.ComparedValue = 5;
compare.Actions.Add(tnote);
fpSpread1.Sheets[0].AddValidators(new FarPoint.Win.Spread.Model.CellRange(1, 1, 1, 1), compare);