New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  priority_gender: 'low'
});

application.template.hbs

Controller priority_gender: <b>{{priority_gender}}</b>

<div class='col-sm-3'>
    {{priority-selector priority=priority_gender}}
</div>

priority-selector.component.js

import Ember from 'ember';

export default Ember.Component.extend({
    priority: 'low',

    actions: {
        click(priority) {
            this.set('priority', priority);
        }
    }
});

priority-selector.template.hbs

<div class="pull-right btn-group" role="group">
    <div type="button" class="btn btn-default btn-for-low" {{action 'click' 'low'}}>LOW</div>

    <div type="button" class="btn btn-default btn-for-medium" {{action 'click' 'medium'}}>MEDIUM</div>

    <div type="button" class="btn btn-default btn-for-high" {{action 'click' 'high'}}>HIGH</div>
</div>

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.10/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.13/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.10/ember-template-compiler.js"
  }
}