[mx 2004 pro]swapdepth for movies belonging to different movie parent

How can I swapDepth 2 differents movies belonging to two different parent movie.

.i.e:
the first movie group (movie1x are empty movie clip…use to import swf file in them).
_level0.movie11.tof11
_level0.movie12.tof12
_level0.movie13.tof13
_level0.movie14.tof14

the second movie group is :
_level0.movegen.xx

_level0.movegen.movie_btn1
_level0.movegen.movie_btn2
_level0.movegen.movie_btn3

How can I swap the Depth between one movie belonging to first group with the second group.

I have tried some “tricks” with getDepths or GetNexthighestDepth but it work only with movie belonging to the same parent…
mx.behaviour.bringtoFront…does not work…
Someone can help me…