Fiori Launchpad - Basic authentication popup

Hi,

I have used the std. class /UI2/CL_SRA_LOGIN for Fiori launchpad log in screen. When there is no user action for long time and the session cookie gets expired; any operation performed(like selecting an app) in this case is bringing a browser basic authentication popup.

How to avoid this by either taking the user to initial login screen instead of the authentication popup ?