Once you have a shrunken version of the movie clip on the first keyframe and the full-size version on the next keyframe, right-click on the timeline and insert a motion tween. Then copy the first keyframe a bit further down the timeline, so that the animation both starts and ends with the shrunken version. Create a motion tween between the full-sized keyframe and the last shrunken keyframe, as well.
Animated Flash-Only Thumbnail Gallery II
By Adrien-Luc Sanders, About.com
On the first frame, shrink the height of the movie clip containing the image and backdrop down to 0.1% using the transform panel. You can’t shrink it to 0, which means that you are going to have a very thin visible line on your stage. The way to fix this is to move your entire timeline over by one frame, with a blank keyframe to start with a stop on that keyframe.
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