http://stackoverflow.com/questions/39036192/what-is-the-ember-way-to-communicate-from-parent-to-child-component

components.my-table.js

import Ember from 'ember';

export default Ember.Component.extend({
  didReceiveAttrs(options){
    this._super(...arguments);    
    //this will run both initial render and rerender.
    //For initial rendering alone options.oldAttrs will not be available
  },
  didUpdateAttrs(options){
    this._super(...arguments);
    //this will run only for the rerender
    if(options.oldAttrs.selectedOptionId.value !== options.newAttrs.selectedOptionId.value) {
      this.send('triggerOptionChangeEvent');
    }   
  },
  actions:{    
    triggerOptionChangeEvent(){
      console.log('triggerOptionChangeEvent ',this.get('selectedOptionId'));
    }
  }
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  selectedOptionId:1,
  actions:{
    changeOption(){
      this.set('selectedOptionId',2);
      console.log(' '+this.get('selectedOptionId'));
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() { 
});

export default Router;

templates.application.hbs

{{parent-component }}
{{outlet}}

templates.components.my-table.hbs

{{selectedOptionId}}
{{yield}}

templates.components.parent-component.hbs

{{my-table selectedOptionId=selectedOptionId}}
<button {{action 'changeOption'}}> Change Option </button>
{{yield}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}