Contextual Components for Drop Downs?

components.dd-content.js

import Ember from 'ember';

export default Ember.Component.extend({
  isClosed: false,
  classNameBindings: [ 'isClosed' ],
  classNames: [ 'drop-down__content' ]
});

components.dd-trigger.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.drop-down.js

import Ember from 'ember';

export default Ember.Component.extend({
  closed: true,
  actions: {
    toggle() {
      this.toggleProperty('closed');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.is-closed {
  display: none
}

.drop-down__content {
	
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#drop-down as |d|}}
  {{#d.trigger}}
    <button>I am the trigger of the drop-down</button>
  {{/d.trigger}}
  {{#d.content}}
    <p>I am the content of the drop-down component.</p>
  {{/d.content}}
{{/drop-down}}
<br>
Now what?
<br>

templates.components.dd-content.hbs

{{yield}}

templates.components.dd-trigger.hbs

{{yield}}

templates.components.drop-down.hbs

{{yield (hash 
  trigger=(component 'dd-trigger' click=(action 'toggle'))
  content=(component 'dd-content' isClosed=closed)
)}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}