>I think that the gray area that I'm trying to change is not part of the docked toolbar (I might be wrong, if you think I am please let me know). I just don't know how to reference the rectangle below the toolbar.

I think it is. Did you try my code looping through screen forms collection?

Though I didn't play with dockable yet.

UPDATE. You're right, this area is not affected. I need to do some research then.