Can't edit animated bone shape?

Hi, either I’ve lost it or Flash has.

I just started experimenting with bones, I quite like it and I’m pleased with the animation I’ve created. Although I would like to edit the shape that the bone structure is manipulating and i can’t for the life of me figure out how. Double clicking does nothing, right clicking offers no useful menu to get into my shape and edit. Looking back I wonder if I should have turned my shape into a movie clip before adding the bones? But Flash didn’t stop me and I assumed I could go back and edit later on. Was I wrong?

Thanks in advance…