Cannot set <Super> to open the Main Menu in Gnome, like I can do in windows

Binary package hint: compiz

I want to have my old practice of using the <super> (windows key) to open the main menu in Gnome panel. I have also configured my Main menu to appear Botton left as in windows os (see the pic included). This is my natural practice and I have pain to leave it.

Although option appears to set any shortcut to open main menu, I cannot have it working rather I have any other option working like <super> + q , it works perfectly fine but only <super> does not work.

This option exist in Main Menu>System>Prefrences>CompizConfig Settings manager > Gnome Compatability>General (see pic uploaded)

I cannot also set the <super> with Grab key, only I have to manually edit the command and write <super> to it, This works for any other command like run but doess not work with 'Show Main menu'

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: compiz 1:0.8.4-0ubuntu15
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
CompizPlugins: [core,ccp,move,resize,place,decoration,session,text,mousepoll,regex,resizeinfo,snap,png,vpswitch,workarounds,svg,imgjpeg,shift,commands,dbus,neg,gnomecompat,wobbly,animation,fade,cube,scale,expo,rotate,ezoom,scaleaddon,staticswitcher]
Date: Sat Aug 21 13:52:34 2010
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: Sony Corporation VPCCW16FG
PackageArchitecture: all
PciDisplay: 01:00.0 VGA compatible controller [0300]: nVidia Corporation GT216 [GeForce GT 230M] [10de:0a2a] (rev a2)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=012ed88f-fa90-4287-9222-b41da0b8d0ab ro quiet splash
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
RelatedPackageVersions:
 xserver-xorg 1:7.5+5ubuntu1
 libgl1-mesa-glx 7.7.1-1ubuntu3
 libdrm2 2.4.18-1ubuntu3
 xserver-xorg-video-intel 2:2.9.1-3ubuntu5
 xserver-xorg-video-ati 1:6.13.0-1ubuntu5
SourcePackage: compiz
dmi.bios.date: 09/22/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0190Y5
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0190Y5:bd09/22/2009:svnSonyCorporation:pnVPCCW16FG:pvrC602E0UF:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VPCCW16FG
dmi.product.version: C602E0UF
dmi.sys.vendor: Sony Corporation
system: distro = Ubuntu, architecture = i686, kernel = 2.6.32-24-generic