Contextual Popover Component

application.controller.js

import Ember from 'ember';

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

application.template.hbs

Click the below button to toggle.
<br>
<br>
{{#popover-container as |popover|}}
    {{#popover.handle tagName="button"}}
      Toggle
    {{/popover.handle}}
    {{#popover.content}}
      Content
    {{/popover.content}}
{{/popover-container}}

popover-container.component.js

import Ember from 'ember';

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

popover-container.template.hbs

{{yield (hash
    handle=(component 'popover-handle' click=(action 'toggle'))
    content=(component 'popover-content' isShowing=isShowing)
)}}

popover-content.component.js

import Ember from 'ember';

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

popover-content.template.hbs

{{#if isShowing}}
	{{yield}}
{{/if}}

popover-handle.component.js

import Ember from 'ember';

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

popover-handle.template.hbs

{{yield}}

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "release",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "release"
  }
}