Adobe Flash Professional CC 2014 v.13.0 - Manual (Page 709)

Layers are added according to these rules:
If there are no objects on the layer other than the selection, the layer changes to a tween layer.
If the selection is at the bottom of the stacking order of the layer (under all other objects), Flash creates a layer above the original layer. This
new layer holds the non-selected items. The original layer becomes a tween layer.
If the selection is at the top of the stacking order of the layer (above all other objects), Flash creates a new layer. The selection is moved to
the new layer and that layer becomes a tween layer.
If the selection is in the middle of the stacking order of the layer (there are objects above and below the selection), Flash creates two layers.
One layer holds the new tween and another one above it holds the non-selected items at the top of the stacking order. The non-selected
items at the bottom of the stacking order remain on the original layer, below the newly inserted layers.
A tween layer can contain tween spans as well as static frames and ActionScript. However, frames of a tween layer that contain a tween span
cannot contain objects other than the tweened object. To add additional objects in the same frame, place them on separate layers.
Videos and tutorials
The following tutorials demonstrate techniques for creating motion tweens:
Video: Tween the position of an object. Creating motion tweens (length: 2:04, Adobe TV)
Video: Creating motion tweens: Part 1 (length: 10:53, Adobe TV)
Video: Creating motion tweens: Part 2 (length: 5:55, Adobe TV)
Video: Tween position and alpha (transparency), edit the motion path, save a tween as a motion preset. Create Animation in Flash
CS5 (length: 5:34, Adobe TV)
Video: Tween position, alpha, 3D rotation, filters, Motion Editor overview, adding eases, copy/paste tween properties, edit motion path,
manipulate tween spans in the Timeline, save, and apply motion presets.
Flash Downunder: Motion Tweening (length: 29:57, Adobe TV)
Video: Layers TV: Episode 71: Animated text (length: 20:19, Adobe TV)
Video: When to use motion tweens and classic tweens. Flash Motion Tweening (length: 10:13, Layers Magazine)
Tutorial: Tween alpha (transparency). How to Create a Motion Tween in Adobe Flash (eHow.com)
Tutorial: Creating a tween, editing the motion path. Timeline animation in Flash (Layersmagazine.com)
Video: Understanding Timeline icons in an object-based tween (Length = 5:08, Peachpit.com)
Animate position with a tween
To make an object move or slide across the Stage:
1. Select a symbol instance or a text field to tween on the Stage. The object can reside in any of the following layer types: Normal, Guide,
Mask, or Masked.
If the selection contains other objects, or it contains multiple objects from a layer, Flash offers to convert your selection to a movie clip
symbol.
2. Do one of the following:
Choose Insert > Motion Tween.
Right-click (Windows) or Ctrl-click (Macintosh) the selection or current frame and choose Create Motion Tween from the context menu.
If the “Convert selection to symbol for tween” dialog box appears, click OK to convert the selection into a movie clip symbol.
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