2.5 problem. Assigning new centers.

This is gonna sound really stupid, but here goes…

How do you assign new centers to an object in 2.5? I can’t find the button in the interface. I don’t know if I’m just experiencing temporary dyslexia, but I can’t find it.

Like, the “Center New” or “Center Cursor.” Not saying, make the center here like the median point or cursor, but changing the center of the object itself.
Hope you understand. Please post if you can help.

There is no button on the default interface but search for ‘origin’ or use Shift+Ctrl+Alt+C