How do I assign midi controls to 2 separate plug ins in the same channel strip?

Hi

I want to set up my Oxygen 2 to control my eq and compressor in the same channel but when I set the 8 knobs to the EQ parameters and then try to do the same to the compressor, I either have to delete the eq controls or have them both assigned to the same knob, which is obviously not what I want to do as changing one knob effects the other plugin. I thought whatever plugin I click would be the one that gets the midi focus, but clearly not, any ideas?

Thanks

Christian.

PS Logic 9 by the way.