midi map in tabs (e.g. loop shifter)

Hi,
sorry this must be a really simple problem:

In a M4L instrument like the loop shifter, I cannot assign midi input to most of the live.dial objects inside different tabs (i.e. when pressing cmd-m in Live, they don't turn blue). In the loop shifter, only the "playback" tab is midi-assignable, and yet I can't see a difference in the patch itself.

Thanks for your help,
yaco