AttachEventHandler in routing method

Hello Experts,

First View

Second View

My requirement is , the first tile "Risk analysis" should be clickable, whereas the other two should not be clickable (when i run the app fro first time).

I am using Routing concept for navigation.

2) On click of the risk analysis tile i am navigating to Second View. When i press the submit button, i want the "Project Complexity Summary" of the first view to be clickable.

I tried using attachPress handler

here is the code on submit of the secondView

on function submit()

{

//

}

Here navigateToProjectComplex method is present in the controller of the first View

  navigateToProjectComplex:function(){

  this._oRouter.navTo("ProjComplex",{});

  },

When i do this, it is throwing me this._oRouter is undefined

pls help