"Create Content" links on Group Content, not just on Group

I'm trying to get "Create Content" links on my Group Content (using D7, OG 7.2 and Panels)

Adding the prepopulate fields to the Group Content makes the links work fine for "Group" nodes, but not for "Group Content". Basically, what I want is the functionality that the "OG Example" module offers, only then on a "Group Content" node, not just the actual "Group" node.