How to integrate Google Authenticator with Standard Thingworx Login

This question I have asked earlier also and tried to implement CustomAuthenticator and integrated with Google Auth But it is not working . It is not calling Google Auth Class. 

I simply want below steps

1. Login to thingworx using Login and password.

2. It will forward to Google Auth Screen.

3. Enter Google Code.

4. Show Composer.

Thanks in advance