I just upgraded architect after being told prompted(upgraded from 2.1.0 build 613 to build 637)

I was using an override on an initcomponent to determine whether a column should show in a grid based on a global variable.
using event listeners to accomplish the same thing was causing errors:
http://www.sencha.com/forum/showthre...914#post892914

I just tried to promote to class on my grid column(something I did last week!), and it is grayed out.
Is this on purpose, or a bug?