Highlighting Mode

System

Hi all,
Using ts 552
trying to highlight labels of an item when the value in the item is wrong
tried such kind of code and it duno work
..................
reviewdateItem.setValid(false);
IWDatacapture.setHighlightMode(true);
IWDatacapture.redrawLabels()
alert(" the value is not corrct ");
result = false;
}
return result

what can be wrong ....?
thanks