Animate/FLASH: Shape Tween

• Open a new flash file (Ctrl+N).
  New Document window will appear
  Select General panel and choose Type: Flash Document . Press OK.
• If your timeline window is not open, press (Ctrl+Alt+T).
• Now you can see a single Layer called "Layer1" in your timeline Window.
  
  
• Select the first frame. Now go to your working area and draw any object. To start off with, may be you can draw a circle.This is going to be your initial object.
  In the above demonstration, my initial object is a short line.
• Select frame 20 and press F6 to insert a new keyframe.
• Still keeping playhead on frame 20, delete the object present in your working area. Now draw a different object, may be a square.
  In the pencil demonstration, we have drawn a long line.
• Select any frame between, 2 to 19 and select Shape from the tween pop-up menu in the Property inspector. Now your Layer will look something like the one shown below.
  
  
• Now press (Ctrl+Enter) to view your motion tween.