Comment 2 for bug 1772184

I would say replace SelectPlaylist with a [Library],SelectPane so that a -1 moves the focus one pane to the left and +1 moves it one to the right. I'm not sure if it should wrap around or not. I would have to see how the new design works to be able to decide that.

Then replace SelectTrackKnob with MoveVertical.

In addition, both Controls must work regardless of which pane, window or even application has focus.