Add a Classic Motion Guide Layer
Flash CS4 Tutorial
How to Define a Motion Path on a Separate Flash Layer
Motion guides are used to define the path of an animated object. The path resides on a separate layer and is generally drawn with the Pen tool. You can also use the Line tool or Pencil tool to draw your path.
This type of motion guide works with Classic Tweens only. A second option is to use a Motion Tween. Whenever you add a Motion Tween, a path is automatically created. For more information, see topic, Motion Tween.
Make sure the timeline/layers panel is open by choosing Window > Timeline.
Add a rectangular object to the workspace with the Rectangle tool (r key).
Name the layer with the rectangle, Content.
Right click the name Content in the Content layer and choose Add Classic Motion Guide from the pull-down menu.
Using the Pen tool, draw a shape to define the object's path on the Guide layer.
Click frame 20 of the Guide layer and press F5 to extend the guide to frame 20.
Click frame 20 of the Content layer and press F6 to add a keyframe with the content from frame one.
Click frame one of the Content layer and move the rectangle to one end of the path. By clicking in the center of the rectangle, the center of the rectangle should snap to the path.
Click frame 20 of the Content layer and move the rectangle to other end of the path.
Right mouse-click the area between the keyframes on the Content layer and choose Create Classic Tween from the menu.
Test your movie (Control > Test Movie) (Cmd/Return (PC-Ctrl/Enter) to view the animation.