showWhen/hideWhen is not working.

`
<ion-navbar *navbar primary hideBackButton>
<ion-buttons left>
<button showWhen="android" (click)="onCancel()" >
<ion-icon name="close"></ion-icon>
</button>
<button showWhen="ios" (click)="onCancel()" >Cancel</button>
</ion-buttons>
<ion-title>Add Location</ion-title>
<ion-buttons end>
<button showWhen="android" (click)="onSubmit()" >
<ion-icon name="checkmark"></ion-icon>
</button>
<button showWhen="ios" (click)="onSubmit()" >Done</button>
</ion-buttons>
</ion-navbar>
`
Version 2 Beta 6
Cordova CLI: 6.0.0
Gulp version: CLI version 3.9.0
Gulp local: Local version 3.9.1
Ionic Framework Version: 2.0.0-beta.6
Ionic CLI Version: 2.0.0-beta.25
Ionic App Lib Version: 2.0.0-beta.15
ios-deploy version: 1.8.6
ios-sim version: 5.0.6
OS: Mac OS X El Capitan
Node Version: v5.1.0
Xcode version: Xcode 7.3 Build version 7D175