Adobe Flash Professional CS6 Adobe Flash Professional CS6 Classroom In A Book | Page 366

define the Mask and Masked layers
You’ll create a rectangular mask that starts small and grows larger to cover the
Stage. The resulting effect reveals the contents of the Masked layer slowly, similar
to a sliding door opening.
1 Open the file page2.fla.
A single layer called content contains a movie clip of the second section about a
new car.
2 Insert a new layer above the content layer and rename it mask.
3 Double-click the icon in front of the layer name, or choose Modify > Timeline >
Layer Properties.
The Layer Properties dialog box appears.
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