tablesorter ajax,JQuery tablesorter using ajax and dynamic thead an

I am attempting to add in some table sorting using the jquery tablesorter plugin to a Rally app using dojo, struggling with how to hook up the update callback for the tablesorter.

I have html that looks like this (thead and tbody are separated as they are being dynamically generated i.e. number of columns is not known in advance):

tablesorter init is here

function onLoad() {

var appCustom = new ReleaseScopeChange();

appCustom.display(dojo.body());

}

rally.addOnLoad(onLoad);

$(document).ready(function(){$("#myTable").tablesorter();});

Code updating the thead/tbody

dojo.byId("sort-head").innerHTML = headresults;

dojo.byId("sort-body").innerHTML = bodyresults;

$('#myTable').trigger("update");

Now, the sorting never actually gets set up at all. If I add a static table I can get the sorting working perfectly, so I am assuming its related to timing between the ajax request and the update trigger.

I have looked through a lot of other answers on this and I'm really not sure what is missing.