 <p>According to the docs (<a href="http://emberjs.com/api/classes/Ember.Handlebars.html#method_registerBoundHelper" rel="nofollow">http://emberjs.com/api/classes/Ember.Handlebars.html#method_registerBoundHelper</a>) you should be using <code>Ember.Handlebars.registerBoundHelper</code> to get this data binding. <code>registerHelper</code> by default is unbound.</p>