anchor.diff:  
   === AppComponent Changes
   
  -Open `app/app.component.ts` and replace the contents with the following code:
  +Open [filename]#app/app.component.ts# and replace the contents with the following code:
   
   [source,typescript]
   .app/app.component.ts
  
positive.code: }
  ----
  
  Here in `HeroesComponent` we have the `<vaadin-grid>` element in the template. In styles, there is a `height: 100%;` rule for `vaadin-grid`. In the template, inside `<vaadin-grid>` there are three columns specified with their corresponding item property names.
  
  Also in the template, the `items` property of `<vaadin-grid>` is bound to the `heroes` array property of `HeroesComponent`. At the same time, we import and use `HeroService` to get the list of heroes and assign the `heroes` property. Angular component data binding takes care of updating `items` property of `<vaadin-grid>` with the list of heroes for us.
  
  [NOTE]
  .PolymerElement Directives
  ====
  Once again, we import `PolymerElement` in this file and add `PolymerElement('vaadin-grid')` to the `directives` of the component to enable all features for Vaadin Grid Polymer element in our `HeroesComponent`.
  ====
  
  === Displaying Heroes List
  
  Finally in this step, change `app/app.component.ts` to provide `HeroService` for our application and display the heroes list component:
  
  [source,typescript]
  .app/app.component.ts
  
negative.code: 
  === Npm Dependency
  
  Alongside with bower dependencies, we also need to add one npm dependency to the project. `@vaadin/angular2-polymer` package adds support for Polymer elements in Angular 2 component templates. Run this command to install the package and save the dependency in [filename]#package.json# at the same time:
  
  [subs="normal"]
  ----
  [prompt]#$# [command]#npm# install @vaadin/angular2-polymer --save
  ----
  
  == Adding Polymer Elements to Our Application
  
  In the previous step, we downloaded elements to bower_components directory. Now we are going to import these elements in our application.
  
  In your project root, edit the [filename]#index.html# file and replace the contents with these lines:
  
  [source,html]
  ----
  