Testing in Flash Player
Flash's Test mode shows you a closer approximation of how your animation will actually appear to your audience than testing on the stage. When you fire up the Test Movie command, your animation plays in the Flash Player that comes with Flash CS5. Test mode is your best bet if your animation contains movie clips, buttons, scenes, hidden layers, or ActionScript, since it shows you all the parts of your animation—not just the parts currently visible on the stage.
Note
Motion paths (the lines) don't appear when you test your animation in Flash Player, for good reason: Flash designed them to be invisible at runtime. If you want to see your motion paths in action, you need to test your animation on the stage.
To test your animation in Flash Player:
Select Control→Test Movie→in Flash Professional.
The Exporting Flash Movie dialog box in Figure 19-2 appears, followed by your animation running in the Flash Player test window, similar to the one in Figure 19-3.
Note
If you're working on a project for a handheld device, you can choose Control→Test Movie→in Device Central. Likewise, if you're working on an AIR project, you can choose one of the AIR options: in AIR Debug Launcher (Desktop) or in AIR Debug Launcher (Mobile). Flash remembers your selection, so the next time you can test your animations with Ctrl+Enter (⌘-Return).

Figure 19-2. When you see this dialog box, you know ...
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