Playing songs in center pane w/o it moving to right pane?

For example, if I click on a playlist, the songs show up listed in the center
(library) pane in WMP12. If I double click to play any of those songs, it
automatically moves the entire playlist (or album or artist) to the right
pane and leaves the center one empty.
How do I get this to stop? In WMP11, I believe, it kept playing in the
center pane until you hit "Edit in List Pane".
I want to be able to see and use both panes at the same time!

 

Not at all! If I have a playlist in the right plane and I'm considering
adding a song to it, but I'm not sure until I listen to said song, I can't do
that, because once I try to listen to it, whatever album or playlist it's in
automatically replaces the playlist I'm trying to edit in the right plane.
I want to be able to play songs in the center while working on a playlist on
the right, but I can no longer do that.
In other words, I can't really work on a playlist in the center, unless
working on it doesn't involve actually listening to it.

 

It can be done the other way around: open the playlist that you want to
add songs to in the center pane. You can drag songs from whatever
playlist is currently playing (and is shown in the right pane) to the
playlist in the center.

Regards