When I said the correct ID was being passed I was mistaken. I had the ID of the row in the subgrid that triggered the reload, NOT the ID of the row in the parent grid.  Fixed that and all is fine.

Thanks again for a great plugin!

gridComplete: function() {
    if(dns_expand_id) {
        //alert(dns_expand_id);
        $('#dns').expandSubGridRow(dns_expand_id);
        dns_expand_id = null;
    }

},

dns_expand_id is initially null.  I need certain events in the subgrid to trigger a reload of the grid and want to expand the subgrid that triggered the reload.  So, after a successful server request I set dns_expand_id to the rowid containing the open subgrid and call

$('#dns').trigger('reloadGrid');

I know from the alert() that the correct value is passed to expandSubGridRow() but it isn't expanding and no errors are generated.

Any ideas on what I'm doing wrong or where I might look?