Width and heigth stuck at zero

Hello,
I have tried to create some Actionscript3 code to load
pictures. A Loader loads the image and then I create a new Bitmap
instance from the loader.content.constructor. But this instance has
always width and height of zero, not matter what I try.
Output of the attached code:
DONE(x=0, y=125, w=0, h=0)
Any help is appreciated.

what's
var duplicate:Bitmap = new imageLoader.content.constructor;
supposed to do?

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