Call prototypical method from "constructor"

Question

I am trying to make the javascript "constructor" call one of it's prototypical methods. Is it possible to do so?

Here is the code:

    function updateableTable($table, $rowTemplate,  dataObjects, getIDFromObject) // at some point add the ability to add event handlers.
{
    this.$rowTemplate = $rowTemplate;
    this.$tableBody = $j($table).children('tbody');
    this.rowsByID = {};
    this.dataObjectsByID = {};
    this.getIDFromObject = {};

    for(var dataObj in dataObjects)
    {
        addRow(dataObj);
    }

    return {}; // still has the protypical methods.
}

updateableTable.prototype.addRow = function(dataObject) {
    //alert('inside add row');
    var id = this.getIDFromObject(dataObject);
    // if (true === doesIdExist(i)) {
        // alert('id ' + id + ' already exists in table.');
        // return false;
    // }
    var newRow = $rowTemplate.tmpl(dataObject);
    this.rowsByID.add(id, newRow);
    this.dataObjectsByID(id, dataObject);
    this.$tableBody.append(newRow);
    return true;
}

it references jQuery and jQuery.tmpl (just a way of converting data to the view of the data, and not really important for this question) and I call it like this:

var $j = jQuery.noConflict();
var peeps = [{ID:1, Name:'mary', Age:21},{ID:2,Name:'contrary', Age:12}];
var personIDGetter = function(person)
{
    return person.ID;
}
var theTableUpdater = updateableTable($j('table.updateable'), 'hi', peeps, personIDGetter);

But it tells me (prototypical method) addRow doesn't exist.

Am I going about this all wrong?

UPDATE: Yes, I did many things wrong. I added a jsfiddle with the suggested fixes as well as a number of other fixes. It adds two rows and deletes one.