Or it seems if you have clicked on the discussion link and the click on the create new article. You don't seem to have the option of creating a draft if you do it this way though.
Yeh - that's a bit strange. Immediately after you've saved it you get the controls back and can withdraw the public post (by moving it to your drafts).
Fixing that is probably a low priority.
After contributions from a number of us (by random example here, here) over a number of months, particularly User:wmoore and User:tommccabe (and all happening before User:Yvain's work here, so we missed those ideas) we have a discussion area.
Discussion, including discussion of the discussion area, is welcome.