pop-up menus are always on the foreground

[Hezi Gildor]

hi,
i am using 1.1.6fix1 on a redhat 6.2
when i open a pop-up menu like Layout->Character, it "insist" to stay
in the foreground. i can move it aside, but cannot have my main Lyx
screen partially cover it. 

is it a bug/change in the new version?

thanks, hezi.