alphabetical tableview headers

I am trying to automatically add alphabetical tableview headers, and I have been working from this post: http://developer.appcelerator.com/question/86921/automatically-add-alphabetical-headers-in-tableview

but I am having trouble adapting it for my purpose... Here is what I have now with no headers. It would be great to be able to get alphabetical headers on this.

var sendit = Ti.Network.createHTTPClient();
    sendit.open('GET', 'http://www.domain.com/read.php?action=1');
    sendit.send();
    sendit.onload = function(){
        var json = JSON.parse(this.responseText);
        var json = json.products;
        var dataArray = [];
        var pos;
        for( pos=0; pos < json.length; pos++){  
            dataArray.push({title:'' + json[pos].name + '', productID:json[pos].id});
            // set the array to the tableView
            themenu.setData(dataArray);
        };
    };
 
    //create tableview
    var themenu = Ti.UI.createTableView({
    style:Ti.UI.iPhone.TableViewStyle.GROUPED,
    height:410,
    top:50
    });