bitmap opacity in flash

M

Mr. x

Hello,
I am using a bitmap.
In frame 1 I copied the bitmap as it.
In frame 20 I put a keyframe (f6), and I wanted to change the opacity of the
bitmap.
I have selected the image, and in the alpha option (color mixer) I put 0,
but the opacity of the image doesn't change a bit.

How can I change the opacity of an image.

Thanks :)
 
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