Multiple yields with block components

pop-over-dialog.component.js

import Ember from 'ember';

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

pop-over-dialog.template.hbs

{{yield}}

pop-over-trigger.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'button',
  
  click: function() {
    this.get('onClick')();
  }
});

pop-over-trigger.template.hbs

{{yield}}

pop-over.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    toggleDialog: function() {
      this.toggleProperty('showDialog');
    }
  }
});

pop-over.template.hbs

{{yield
  (
    hash
      trigger=(
        component 'pop-over-trigger'
        onClick=(action 'toggleDialog')
      )
  )
}}

{{#if showDialog}}
  {{yield
    (
      hash
        dialog=(
          component 'pop-over-dialog'
        )
    )
  }}
{{/if}}

templates.application.hbs

{{#pop-over
    as |p|
}}
  {{#p.trigger}}
  	Click me
  {{/p.trigger}}
  
  {{#p.dialog}}
  	<p>Some interesting content here.</p>
  {{/p.dialog}}
  
{{/pop-over}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": true,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  }
}