Actionscript 3 :: Loading And Unloading New Models?

am using pv3d to load a couple of models for a school project. The models typically don't do much, they just spin on a dial when fired up. At any given time, there are only two models shown. My initial thought is to utilize two global Collada instances and have a function call the Collada load function to load the new models into the instances. Looking through the Collada parser, it would seem that the load function appends the new model, leaving the existing models up there, as opposed to loading in a new set of vertices.

Fair enough. At this point I decide that I should remove the models from the scene, and create new ones every time the function fires.Here is where my problem lies. This probably from my lack of understanding on the workings of AS3/pv3d, so please bear with me. When I remove the models from the scene and add them again, the models do not appear within the scene. However, the model instances still remain traceable when I run a trace.Here is the code for reference. I omitted the portions which are duplicates.Instances are created on a global level as onRenderTick can't seem to reference it if I create it on any other level

public var model:Collada = new Collada();
public var model2:Collada = new Collada();

The initial properties such as x y position and pitch are set when the dials are created

public function setupDials():void {
var materialList:MaterialsList = new MaterialsList();
var bitmapFileMaterial:BitmapFileMaterial = new

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