KH2 Help - Hollow Bastion ->Radiant Gardens

Hey. I'm playing through KH2 at the moment and I'm trying to complete Hollow Bastion, transforming it into radiant gardens but I'm having a few issues.

I've completed the PrideLands level along with every other thing I can think of but when I go to Hollow Bastion a cutscene that's supposed to happen doesn't. This means when I return to the Tron world nothing happens.

I've tried looking this up but all anyone says is that you need to have done both keyholes of the Pridelands which I have done. Have I missed something here or am I just being a retard? Thanks for your help guys.

Have you completed everything in Hollow Bastion? There are three keyholes to get and the world will only turn to Radiant Garden if you get the third one, which in turn only gets activated once you've defeated the Master Control Programm.