It's me again! Verbbar man!

(I don't even like verbbars... but it's a good practice!)
Mnemonic, in the wishlist forum you wrote:
* Verb icons + Text field "Talk to Woman", "Use Lever", etc. (LucasArts style)
Can be done using the GUI layer. Although, as I mentioned in another thread, you must design your scenes with respect to that; by default the scenes cover the whole screen.
Ok, now I've got my window "verbbar" at the bottom of the screen. No problem, if the game area can't scroll vertically (when its height is "screen.height - verbbar.height".)
Now - let's say I WANT the main layer to scroll vertically and I use the Room scene from the wme_demo.
So I adjust the floor region and expand the height of the main layer - now there is enough place for the verbbar, if the scene would scroll to the bottom.
But - uh - how could it scroll down now ? The actor cannot reach the bottom of the main layer, because you can't click it, the verb bar is there. The actor can only walk to the upper edge of the verb bar (and the scene does not scroll down there).
I tried to turn off the AutoScroll and manage the scrolling by an attached evil script with a "ScrollTo()", but this command somehow didn't work at all for me.
So finally : is there a trick to tell AutoScroll the height of the game area instead of the screen height ? Or something I just didn't think of ?