Cannot addChild in afterRender

[Duder-onomy]

This has to do with the fact that the parent is starting, if you break on the line childView.start() you will notice that the parent or this has no el.
this.el does not exist.

function _addChildInstance (childView) {
        var child;
        if (!_(this.children).contains(childView)) {
            this.children.push(child = childView);
            childView.parent = this;
            if(this.hasStarted && !childView.hasStarted) {
                childView.start();
            }
        }
        return child;
    }