Working sets again :)

[Leon Pollak]

Hello.

I am again with working sets...:-)
The interface seemed to change again.
Now, I want to create new WS. 
Previously, as Milian Wolff taught me, I closed the current working set and 
opened a file - this created the new WS.

Now, there is a new option "Stash". Pressing it removes the current WS. When I 
open some file, I see the new WS created.
Great! But how do I return to the "stashed" WS - I was not able to understand.

Thanks ahead for clarification.
-- 
Leon