Hide menu bar on multiple displays

Hi all,
I can't get a robust solution to this..

I'm using the size message on jit.window object to create a window that spans over multiple displays (with no borders, etc..). The message sfmenubar does not have effect because the window is not using fullscreen. I'm trying with ";max hidemenubar" but when the cursor moves on top of the screen the menu bar shows up.

Anybody has a solution to this?

Thanks!
j