Bone tool controlling both arms

Hi there,
I’ve started an animation involving a character moving his arms in two separate movements, yet whenever I open Flash, the arms are given the same movement, but the bone tool still remains in place as if they were different. Then when I try to move one of the arms in attempt to make them have separate motions again, it moves both arms, even when the other armature layer is locked!
I’m kind of a newbie when it comes to Flash, but does any one know of a way to fix this?

Thanks,
Hippo