Very Very Eaaasy Question

Hello!

I really need to know how I can do this. I have a mc on my root called mc1.


Code:
_root.aktuellmc = "mc1"
_root[aktuellmc]_y = 190
why doesn't this work


And that is just a practice example, I know I can do this by just typing:

Code:
_root.mc1._y = 190
Thanx for help