Object.registerClass Issues
Object.registerClass, however, is not without its problems.

• Movieclips on the timeline are technically created in frames before code is run. Because of this, using Object.registerClass in a frame won’t work on movieclips created in that same frame on the timeline. This can be a speed bump since, unless you dynamically create your movieclips with Actionscript, you would need to declare Object.registerClass at least one frame prior to the desired movieclips appear on the screen.
   
• If you have 2 instances of the same symbol appearing on screen through the timeline on the same frame but want one of those movieclips to have a different class association than the other, Object.registerClass won’t be able to differentiate from the two. This goes back to number 1 where, because the movieclips are created in a frame before the code is run, you really have no opportunity to be able to have it run between two separate clip initializations.
   
• Object.registerClass can’t be used with existing movieclips. Registering a class to a movieclip symbol only effects movieclips created after that association is made. Object.registerClass won’t effect any movieclip currently on the screen.
   
• It won’t work with createEmptyMovieClip. Because createEmptyMovieClip creates a completely dynamic empty movieclip with no pre-defined symbol association (or library presence), Object.registerClass has no way of targeting such a movieclip prior to its creation. To get around this, you could easily just have an empty movieclip in your library and use attachMovie to attach it when needed with the appropriate class registration to your liking.
   
• And lastly, due to the nature of how movieclips are made and how the constructor is run for movieclip instances separately, you have no means of directly passing arguments to your class constructor calls for movieclip instances as you are capable of doing with other objects. No doubt a formidable problem, though there are ways to handle it.

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