[away3d] obj.visible=false/true not working ??

[jojo]

I have 3 .obj files I load in and want to (for now) simply scroll thru
displaying/hiding them using a button. When I try to hide/show them
with obj1.visible=false; or obj1.visible=true; via button it simply
does not work.

//loading 3 files
obj1 = Obj.load("obj1.obj")
obj2 = Obj.load("obj1.obj")
obj3 = Obj.load("obj1.obj")

//add 1st to the scene only
scene.addChild(obj1);

//create a button
textBut=new Button();
addChild(textBut);

// button listener
textBut.addEventListener( MouseEvent.MOUSE_DOWN, txtButMouseDown );

//button handler to scroll thru objects ensuring 2 are removed and 1
added
if(objtoload == 3){objtoload=0}
objtoload=objtoload+1;

if (objtoload==1){
        trace("objtoload load 1");
        obj2.visible=false;
        obj3.visible=false;
        obj1.visible=true;}
if (objtoload==2){
        trace("objtoload load 2");
        obj3.visible=false;
        obj1.visible=false;
        obj2.visible=true;}
if (objtoload==3){
        trace("objtoload load 3");
        obj2.visible=false;
        obj1.visible=false;
        obj3.visible=true;}

nothing done in the onEnterFrame, however ... hmm ...

I think the logic of swapping is solid (the traces of objtoload look
good) so maybe the fact nothing is done in onEnterFrame is making it
fail?

The failure mode is obj1 displays and on button press obj1 stays and
nothing else appears. No compile or runtime errors. Subsequent button
clicks increments objtoload (1 to 3) but nothing displays except obj1.

I uploaded the little project (with assets) into the group upload area
as Test67.zip if anyone wants to try it for me ...

http://groups.google.com/group/away3d-dev/web/Test67.zip

Thanks in advance.