How to append custom value to parameter

[wiltwitt]

I am using dhtmlxGrid and dataProcessor to insert a row.

dp = new dataProcessor(“/data/save”);

Is there a way to do this?
dp.addToParm(“customValue”,“foobar”)

so that param will look like this? “gr_id=2&cell=33&!nativeeditor_status=insert&customValue=foobar”

thanks