Adding stroke to composite

Hello. Does anyone know how to add a stroke outline to a composition?
I have my animation inside this composition, and what I needed, in photoshop terms would be to select that layer (meaning composite o animate pro) and go Blending Options and Stroke. Then adjust the colour, thickness etc.
I even tried messing with the glow module or shadow module, but i can`t manipulate it so it doesnt do that fadeout to the colour.

Basicly what I need it to make the Shadow module NOT fade out, like a cartoon solid black shadow with no shades of grey, and then I would put some radius on it and I would have my contour stroke.

Any ideas how to do that? Thanks!

Thank you! That works!!!

Have you tried the Matte Resize effect?

~Lilly