removeChild

Hi.
I have this structure of movieclips in “Test” main class.

Where “this” refers to object Test.

All the classes extends MovieClip.

this.mc.circle
this.circle0

I want to remove circle from mc within the circle0 class.

I´ve tried this:

MovieClip(parent).mc.removeChild(circle)

And I get this:

Access of undefined property circle.

Any help?