[flexcoders] attaching one instance of a displayobject to multiple containers

[blc187]

Is there a way to attach a displayobject to more than one container?
I have a canvas that I instantiated and drew onto, but I want to attach 
it onto two separate containers without having 2 separate instances of 
it.

When I do this:

var obj:MyCanvas = new MyCanvas();
container1.addChild(obj);
container2.addChild(obj);

it only shows up as attached to the second container.
How can I attach it to two without having to instantiate two versions 
of it?