F10 does not recall hidden menubar

[keizie gmail com]

With gconf-editor, I chekced /apps/epiphany/lockdown/hide_menubar TRUE.
Then,
 1. I expected epiphany to hide or show menubar immediately. But not.
 2. Close all epiphany windows. Open again. Hide works.
 3. Press F10 key but nothing shows up.

Package information is like this.
ii  epiphany-brows 2.14.0-0ubuntu Intuitive GNOME web browser

As far as I know, my gnome system does not bind F10 for any other task.
How can I use instant menubar?

	kz.