I used to have a tutorial about Flash Tweeningthe effects can be very bizzare if Flash is left to decide the transformation shape but you can set Shape Hints on key points of a shape to ensure the shape follows a certain path.
Q&D example Ctrl + Shift + H adds a Shape Hint to a Shape Tween
( Q&D example Ctrl + Shift + H adds a Shape Hint to a Shape Tween
maiden is filmed before a live studio audience,
Wed 17 Aug 2011, 14:03,
archived)