Adobe Flash Professional CC 2014 v.13.0 - Manual (Page 744)

Shape hints contain letters (a through z) for identifying which points correspond in the starting and ending shapes. You can use up to 26 shape
hints.
Shape hints are yellow in a starting keyframe, green in an ending keyframe, and red when not on a curve.
For best results when tweening shapes, follow these guidelines:
In complex shape tweening, create intermediate shapes and tween them instead of just defining a starting and ending shape.
Make sure that shape hints are logical. For example, if you’re using three shape hints for a triangle, they must be in the same order on the
original triangle and on the triangle to be tweened. The order cannot be abc in the first keyframe and acb in the second.
Shape hints work best if you place them in counterclockwise order beginning at the top-left corner of the shape.
Use shape hints
1. Select the first keyframe in a shape-tweened sequence.
2. Select Modify > Shape > Add Shape Hint. The beginning shape hint appears as a red circle with the letter a somewhere on the shape.
3. Move the shape hint to a point to mark.
4. Select the last keyframe in the tweening sequence. The ending shape hint appears somewhere on the shape as a green circle with the letter
a.
5. Move the shape hint to the point in the ending shape that should correspond to the first point you marked.
6. To view how the shape hints change the shape tweening, play the animation again. To fine-tune the tweening, move the shape hints.
7. Repeat this process to add additional shape hints. New hints appear with the letters that follow (b, c, and so on).
View all shape hints
Select View > Show Shape Hints. The layer and keyframe that contain shape hints must be active for Show Shape Hints to be available.
Remove a shape hint
Drag it off the Stage.
Remove all shape hints
Select Modify > Shape > Remove All Hints.
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