radio_button_group.handlebars

{{#each button in view.content}}
  <label>
    <input type="radio" {{bindAttr value="button.value"}} {{bindAttr name="view.groupName"}}/>
    {{button.label}}
  </label>
{{/each}}

radio_button_group.js.coffee

App.RadioButtonGroup = Em.View.extend
  templateName: 'radio_button_group'
  classNames: ['radio-group']
  groupName: (->
    "radiogroup-#{Em.guidFor(@)}"
  ).property()

  change: ->
    @set 'value', @$('input:checked').val()

  updateSelected: (->
    @$("input[value=#{@get('value')}]")[0].checked = true
  ).observes 'value'

  didInsertElement: -> @updateSelected()