Masking attached movie clips

Hi there -

i am trying to apply a mask to some attached movieclips.

i am having some problems, i am assuming due to the depth difference between the mask (placed on stage hence with a negative depth) and the attached movie clips (positive depth).

i have tried swapping depths and also assigning a higher depth to the mask (using getNextHighestDepth), but nothing seems to work.

does anybody know of any way around this?

ta

(btw…is it possible to attach a mask?)