Live Binding ejs with can.observe does not update

I have an observable like this:

1. this.myData = new can.Observe({
2.             'counter': 1,
3.             'something': {ref: 'nothing'}
4.         });

I load the template like this:

1. $('.myTemplateElements').html('simpletemplate.ejs', { myData: this.options.myData});

This is in another controler. I have passed the observable at initialization.

The template works (the first time).

If I change the Observe like this:

1. this.myData.attr('counter', Math.random() );

myData is altered (the counter). I also get the change-Event from the Observe.
But I do not get an update in the template.

What could I be missing for the live binding?

Jochum.