Navigating through pages in AppBuilder

Hi All,

     I am new to the AppBuilder and SAPUI5 development. I am trying to build a tablet based app which has three views - Home

Page.view.html,  newPage.view.html, newCustomer.view.html (all the three views being the general page and not tab page or dialogue page).

I have a button in the  HomePage - ChanceCustomer, pressing which should take me to the newPage.view (control name changeCustomer).

Below are my codes

//Code for HomePage.controller.js

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////

sap.ui.controller("view.HomePage", {

    onInit: function(){

  this.getView().addEventDelegate({

  onAfterHide: function(evt) {

  //This event is fired every time when the NavContainer has made this child control invisible.

  },

  onAfterShow: function(evt) {

  //This event is fired every time when the NavContainer has made this child control visible.

  },

  onBeforeFirstShow: function(evt) {

  //This event is fired before the NavContainer shows this child control for the first time.

  },

  onBeforeHide: function(evt) {

  //This event is fired every time before the NavContainer hides this child control.

  },

  onBeforeShow: function(evt) {

  //This event is fired every time before the NavContainer shows this child control.

  }

  });

  },

  onAfterRendering: function(evt){

  },

  homePage_onNavButtonTap: function() {

  },

  btn_onTap: function() {

        var bus = sap.ui.getCore().getEventBus();

        bus.publish("nav", "to", {

            id : "appView--page"

        });

    },

  OnChangeCustomerbtn: function(evt) {

  var bus = sap.ui.getCore().getEventBus();

  bus.publish("nav", "to", {

  id : "changeCustomer"

  });

  },

});

////////////////////////////////////////////////////////////////////////////////////////////////////////

I have added the OnChangeCustomerbtn, but it still doesn't work when I try to run the app. I have previously looked at the MVC example , but is there any other way to make this button work?

Regards,

Ravi