SSO details getting cleared after closing webdynpro in a Module Pool Window

Hi Experts,

I called webdynpro application in a Module pool window on selection of Menu option, using FM WDY_EXECUTE_IN_PLACE with Single Sign on enabled. I am able to call the application correctly without signing in. However, when I close the window, and try to call the same application again with menu option, system is prompting for login details. I have initialized ' CL_GUI_WDR_VIEWER' (changing parameter result) details before calling the FM, but no use.

How can I retain the Single Sign-on information after closing the application (through Close Button of window) which is called in a window ?

Regards

Prasad