You have a parameter for the _mc sprite, which I assume
references a sprite on the stage so that you can scale it. If you
want to reference other objects on the stage to move or scale,
you'll need to add parameters for those objects (my tf is just an
invented object). If you are trying to move around lots of objects
you could reference them via getChildAt() rather than adding
parameters for each object.
For example if _mc is the only thing on the stage, you could
eliminate the parameter and refer to it as: this._mc=getChildAt(0);
If there's another sprite above it, then add a variable
something like:
private var tf:Sprite;
and in the constructor:
tf=Sprite(getChildAt(1));
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