enableHeaderMenu does not work

Hi ,
I added enableHeaderMenu(true) and it still does not work.
Here is the sample of my code :

var mydata=’<?xml version="1.0" encoding="UTF-8"?>’+
‘’+
‘’+
‘Year’+
‘Month’+
‘StudentName’+
‘DOB’+
‘’+
‘px’+
‘’+
than comes the actual rows

and finally I use
mygrid.enableCollSpan(true);
mygrid.enableMultiline(true);
mygrid.enableRowspan(true);
mygrid.setSkin(“xp”)
mygrid.enableAutoHeight(true);
mygrid.init();
mygrid.enableHeaderMenu(true);
mygrid.loadXMLString(mydata);

when i rightclick on the header nothing happens.

I am using RowSpan & CollSpan extensively could that be the reason ?

Also , If this works , is there a way that i can froze some Columns so that user does not see those when they rightclick on the header.

We have a licensed Pro Version.

Thanks

do we have anybody who could provide an insight on this ?

thanks