title: Why click function triggers twice for custom component in Angular 2
body: <p>My custom component <code>click</code> function is triggered twice - both custom component's event and sample level event are triggered.</p>
  
  <p>Here's my Plunker:</p>
  
  <p><a href="https://plnkr.co/edit/wp2iWh7OStdPm5uXsWbP?p=preview" rel="noreferrer">https://plnkr.co/edit/wp2iWh7OStdPm5uXsWbP?p=preview</a></p>