Windows 7 has introduced the concept of Jump list and removed the old system menu.
But you can get the old standard system menu (XP, Vista style) using Rammichael's
7 Taskbar tweaker
Please note that right clicking on title bar of any application, and
right click on taskbar thumbnail preview still gives the old style system menu with PMW menu injected ;).
I hope that in next version of PMW I will be able to give following two options to Windows 7 users.
1. Inject PMW system menu into Jump list.
2. Allow user to disable Jump list and show standard system menu.
Sphere: Related Content