Using report parameter values in a chart title

Migrateduser

Good morning, All!
As the title says, I'm trying to pull in report parameter values and use them in a chart title. After searching for a while (and finding some answers on the opentext boards), I was able to piece together the following:

beforeGeneration: function(chart, icsc)
{
var month = icsc.getExternalContext().getScriptable().getParameterValue('month1');
var year = icsc.getExternalContext().getScriptable().getParameterValue('year1');
var customer = icsc.getExternalContext().getScriptable().getParameterValue('customer');
var grade = icsc.getExternalContext().getScriptable().getParameterValue('grade');
chart.getTitle().getLabel().getCaption().setValue(month + ' / ' + year + ' ' +
'Customer: ' + customer + ' ' + 'Grade: ' + grade);
}

Now, this doesn't break the report as earlier attempts did, but it doesn't modify the chart title either..... What piece am I missing?

Thanks in advance for the help!

Scott