ActionScript 3.0 :: Can't Access A Display Object

I have MCs loaded from the Fla library through my main class. These are drag objects. When one of these is clicked, I want the player to run a function that will disables some based on one selected. When I tried the obvious reference, I had an error. I've been advised to add these to an array, but I can't even do that.

Code:

import HO_42;

I set the objet to a variable above the constructor function:

Code:

private var office:HO_42;

The constructor calls a function that loads the objects to the stage (and this works fine if I don't try to access the object), here is an example of the load and access code:

Code:

office = new HO_42();
addChild(office);
office.x = 441.9;

[code].....