Missed snapshot tab in virtualbox

view story

http://askubuntu.com – I have Ubuntu 12.04 and VirtualBox 4.1.12. All manuals and help documents refer to Snapshot tab in top right corner of Virtualbox manager. But I have no idea where can I find it. Screenshot is attached. Does anybody know anyting about how can I get acces to Snapshot manager tab? (Take a snapshot I can when machine is running). (HowTos)