Need help with mechjeb research

[sittinginatincan]

I'm in need of some help here; I installed mechjeb late into career mode and I cannot re-research the required parts on the tech tree.  I know the mod is working correctly because for whatever reason the MechJeb2 AR202 case can be installed, but no dice for any other parts.  I've already researched advanced flight control and field science, but the associated parts don't show up in the VAB when building, and for whatever reason the AR202 does.  How can I "unlock" the other parts on the tech tree?

[micr0wave]

It's not really additional parts you unlock, the case is always the same, just the number of functions increase while you climb up the tech tree.

[sittinginatincan]

Awesome.  Thanks!