Should be a piece of cake: targeting a variable defined at root

I want to find out the value of an index of an Array defined on the main timeline, from within a MC on the stage.

In AS2.0 this would be as simple as trace(_root.mk_contArray[0])

In AS3.0, naturally something like trace(root.mk_contArray[0]) just doesn’t work, nor any other variation I’ve tried.

Is it something to do with addChild()? This instance is named, but I haven’t used that method.