activeSheet.setValue(0, 2, 5);
activeSheet.setValue(1, 2, 4);
activeSheet.setValue(2, 2, 5);

spread.options.highlightInvalidData = true;
var dv = GC.Spread.Sheets.DataValidation.createFormulaListValidator("$C$1:$C$3");
dv.showInputMessage(true);
dv.inputMessage("Pick a value from the list.");
dv.inputTitle("tip");
activeSheet.setDataValidator(1, 1, 1, 1, dv, GC.Spread.Sheets.SheetArea.viewport);
var validList = activeSheet.getDataValidator(1, 1).getValidList(activeSheet, 1, 1);
alert(validList);