>>I now feel obligated to run them, though :)
>
>Wow, I am always amazed how simple questions turn out to be not so simple.
>
>FWIW, my platform is NT. Please let me know what you determine.

Seems to be the only thing which is sure to work is, as Vlad mentioned along the way, a grid in a container, where

grid.top=-header.height && note the minus sign here
grid.left=0
container.width=grid.width
container.height=grid.height-grid.header.height

That should still keep the grid header in its usual size, but it would stretch below the top edge of the container and therefore be invisible. You may need to nudge the vertical settings for this by a pixel or two, but that'd be it.