Adobe Flash Professional CC 2014 v.13.0 - Manual (Page 711)

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4. With the object selected on the Stage, set a value for a non-position property, such as alpha (transparency), rotation, or skew. Set the value
with the Property inspector or with one of the tools in the Tools panel.
The current frame of the span becomes a property keyframe.
You can display different types of property keyframes in tween spans. Right-click (Windows) or Ctrl-click (Macintosh) a tween span and
choose View Keyframes > property type from the context menu.
5. Scrub the playhead in the Timeline to preview the tween on the Stage.
6. To add additional property keyframes, move the playhead to the desired frame in the span and set a value for the property in the Property
inspector.
You can also tween properties along an entire tween with the Motion Editor. See Editing property curves with the Motion Editor for more
information.
Add an additional tween to an existing tween layer
You can add additional tweens to an existing tween layer. This allows you to use fewer layers when creating Flash content with animation.
Do one of the following:
Add a blank keyframe to the layer (Insert > Timeline > Blank Keyframe), add items to the keyframe, and then tween the items.
Create a tween on a separate layer and then drag the span to the desired layer.
Drag a static frame from another layer to the tween layer and then add a tween to an object in the static frame.
Alt-drag (Windows) or Option-drag (Macintosh) to dulicate an existing span from the same layer or a different layer.
Copy and paste a tween span from the same or different layer.
You can copy the target object of a motion tween to the clipboard at any frame in the tween span.
Edit the motion path of a tween animation
You can edit or change the motion path of a motion tween in the following ways:
Change the position of the object in any frame of the tween span.
Move the entire motion path to a different location on the Stage.
Change the shape or size of the path with the Selection, Subselection, or Free Transform tools.
Change the shape or size of the path with the Transform panel or Property inspector.
Use the commands in the Modify > Transform menu.
Apply a custom stroke as a motion path.
Use the Motion Editor.
You can use the Always Show Motion Paths option to show all motion paths on all layers on the Stage simultaneously. This display is helpful
when designing multiple animations on different motion paths that intersect each other. When a motion path or tween span is selected, you can
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