Single Application with both authentication and anonymous user

Hi,

My requirement is to launch the SAP UI5 XS application with no authentication.

The user can play around the application, but on click of save button the UI Form Login should appear asking for the authentication.

Can some one explain me the possibility of this use case?

I have tried something like the below one, but it does not seem to work. i.e. My application is opening with no authentication but on click of save, the form login does not come up, but just the error is thrown.

Thanks & Regards,

Monissha