Rigify Button missing (v 2.77) Used Rigify to rig my model and like it a lot.  However, the Rigify Button/Generate does not appear in any mode, including Object mode so that's not the issue.
Rigify is an Add-on.

It has to be enabled. Open the system preferences 

CtrlAltU

And enable Rigify



If you want the addon to be enabled permanently press on the Save User Settings.