Hello,
In the PackageKit GUI (Add/Remove Software) , the shell-extension : gnome-shell-extensions-drive-menu has the following description :
" Adds a menu in the system status area that tracks removable disk devices attached and offers to browse them and eject/unmount them "
However, clicking on the mounted devices only opens nautilus for browising the device, but doesnt eject the drives. I even tried clicking on the far end of the menu where the mounted symbol comes, but that doesnt help.