This is wrong, you need to do like this,
in index.html give an id for youe app,
var app = new sap.m.App("myApp", {initialPage:"page1"});
and in your controller get that app and view througth the id's,
HarveyBallMicroChart: function() {
var app= sap.ui.getCore().byId("myApp");
var view= sap.ui.getCore().byId("idView1");
app.to(view);
}