Setting Legend Title from report parameters

system_migrated

Good day

I'm trying to create a reports that includes some multi-line charts
What I'm trying to do is to use some report parameter as values for the legend title . In example: each chart has several lines, each one representing the performance of a LAN switch port. Each port correspond to a report parameter . I' ld like to make this report portable and hence I' ld like the legend title to be taken by the report parameter .
I've tried to use an event handler like the following one in the chart :

function beforeDrawLegendItem( lerh, bounds, icsc )

{
if (lerh.getLabel().getCaption().getValue() == "1"){
lerh.getLabel().getCaption().setValue("pippo");
}
if (lerh.getLabel().getCaption().getValue() == "2"){
lerh.getLabel().getCaption().setValue("pluto");
}
if (lerh.getLabel().getCaption().getValue() == "3"){
lerh.getLabel().getCaption().setValue("paperino");
}
}

where "1","2","3" are the value used in 'Format Chart' wizard as Series Title.
It work as long as i use strings in the setValue() , but it fail if I try to use a report parameter instead . Can anybody help me ? Thanks for your time