flash (macromedia): If I wanted to make tweening so that the object becomes transparent I set
alpha to 0 for that object in the last keyframe in the Color pallet, but it
is still visible.
How do I do it correctly?

The object:
In a movie clip I have several layer, each layer containing a Bitmap fragged
from the Library
Every Bitmap in its layer is tweened geometrically
I need to alpha-tween eather each Bitmap, or the whole thing in one go if
this is possible

[quoted text, click to view]
you have a correct tween, i.e. a full line with an arrow?

on the final keyframe, you click the object, and the properties tab gives you
some settings. You have a pulldown set to "color" and you are changing the
color there, I believe.

What you need to do is change that pulldown to "alpha" and simple set the
alpha there to 0%.

Yes. But my problem is that I cannot figure out how to set alpha to 0 at the
finale keyframe.
If I go to the final keyframe, select the layer and the picture in it, set
alpha to zero in the Color pallet, nothing changes

[quoted text, click to view]
clip like you said before.