How to: Switch between sub-windows: Midi editor inside of edit window

[bashville]

Problem--I have the midi editor open as a sub-window beneath the regular edit window. You can see one is highlighted with a yellow boundary around the top of the "active" section. I like to work with both the full track regions visible above, and work with the midi contents underneath. If you use the function keys to switch tools, it switches the tool in the highlighted window.

So I've dug around in the reference guide and online, and I wasn't sure how to search for this. Is there a shortcut to change the focus between the upper and lower sub-window? Right now, the only way I know how to do it is to click on the section I want. That method is becoming annoying, and I'm wishing I could find a key command for it.

Does anybody know how to do this? Thanks for any response--Kevin