How can I populate a jqGrid cell with a sparkline graph

Question

I'm having trouble figure out the proper way to get a sparkline graph rendering in a jqgrid cell and can't for the life of me find any relevant samples anywhere.

Anyway, after some research I decided the thing to do was try injecting the sparkline graph into the cell on afterRowInsert. Unfortunately I am doing it wrong. Here is what I am doing:

        afterInsertRow: function(rowid, rowdata, rowelem) {
            var cell = jQuery('#datapointlist').getCell(rowid, 'Graph');
            $(cell).sparkline([1,34,3,2,1])
        },

The contents of the cell on insertion is 'Loading' and after the event it remains unchanged. I'm not really even sure if this is the best way to try to get this working so if anyone can help me out it would be much appreciated.