setMask, using a gradient mc to a Loaded image, possible?

I've tried to be very descriptive on title, cause i have found around loads of "setmask does not work on dynamicly created mcs'. My case quite differs. =x

I've got 2 mcs, one holds an gradient and the other is the loader. The image is loaded using the loadmovieclip class.

First I've tried to set the code in the mc that holds both. Failed. Also tried setting on parents, and onLoadInit. All failed.

Is what I'm trying to achieve possible?

Thanks

Ps: Surelly I've done double testing for each time I've tried. Firstly I would try placin an image inside the loader mc, to be sure the code was working without the load, and only then check with loading.