Flash CS3 Tutorial
How to Scale and Move Flash Objects Over Time
This effect requires that you start with a Drawing Object or a Symbol.
Add a rectangular object to the workspace with the Rectangle tool (r key).
With the rectangle selected, choose Insert > Timeline Effects > Effects > Expand.
In the dialog box, input values for the Effect Duration, then select Expand, Squeeze or Both.
Click the Update Preview button to see the changes before accepting your animation.
Click the direction icons to select the Direction of Movement.
You can also set the Shift Group Center, Fragment Offset, and Change Fragment Size values.
Once you are satisfied, click OK. A new symbol is added to the workspace.