Could you please explain why my `ng-confirm-click` doesn't work?

```
<div ng-controller="MainCtrl" ng-init="show=true;">
  <p >Hello {{name}}!</p>
  <button ng-show="show" confirmed-click="changes();show=false;" ng-confirm-click="Confirm change?">change</button>
</div>

```

I need to hide the button.

Here the example:

```
<!DOCTYPE html>
<html>

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.4.x" src="https://code.angularjs.org/1.4.12/angular.js" data-semver="1.4.9"></script>
    <script src="app.js"></script>
  </head>

  <body ng-app = "plunker">
    <div ng-controller="MainCtrl" ng-init="show=true;">
      <p >Hello {{name}}!</p>
      <button ng-show="show" confirmed-click="changes();show=false;" ng-confirm-click="Confirm change?">change</button>
    </div>
  </body>

</html>

```