ionic2 - Ionic 2 App Back button behaviour to navigate to another page -


i have used this.navctrl.push() navigate new page on click of button. creates default button clicking takes me previous page. want navigate page on click of button. how can ?

i have tried doesn't work : 

constructor(public navctrl: navcontroller, public navparams: navparams,public platform: platform) {   platform.ready().then(()=>{        platform.registerbackbuttonaction(()=>this.myhandlerfunction()); });   } myhandlerfunction(){ this.navctrl.setroot(vesselsearchpage);  }

inject platform 'ionic-angular' , register new handler button action:

import { platform } 'ionic-angular';  constructor(private platform: platform) { }  ionviewwillenter(): void {     this.platform.registerbackbuttonaction(() => this.backbuttonfunc()); }  private backbuttonfunc(): void {      //  }

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