Removing a Bitmap

Hello,
I’ve created some sort of bitmap, and used addChild(bitmap) onto the stage.
Afterwards I tried to remove that bitmap in order to add a diferent bitmap with the removeChild(bitmap) function.

I tried using the addChildAt() and removeChildAt(), but it doesn’t remove the Bitmap, but keeps the old one while sticking the new Bitmap in front.

Maybe bitmaps aren’t removable from the stage…?

Thanks,
Omer