Passing a callback to a component - possible?

- Pass an object to the sub component and have that sub component modify the object directly, I am not really fond of this approach, I don't want sub components modifying the state of my objects.

- Have the component trigger DOM events, this works well, but it always feels like it is more work than was is needed.

Another approach that I would like to use is to simply pass a callback function to the sub component. I have seen React using this method:

<FundooRating value={this.state.rating} max="10" onRatingSelected={this.handleRatingSelected} />
Source: http://www.quora.com/Pete-Hunt/Posts/Facebooks-React-vs-AngularJS-A-Closer-Look

I'm trying to replicate this in CanJS, but can't make it work yet. Please see this fiddle
http://jsbin.com/rotal/2/edit

Is it possible? What I'm missing?