Creating composit effects such as Parallel and Sequence is easy in Adobe Flex, you can declare it and have children effects directly under it.  For example:

  
  
  …
The Adobe documentation indicates that the “children” attribute is optional.  So the above declaration is essentially the same as:
  
    
    
    …
  
However, if I declare a component that inherits from Sequence, I will have to explicitly declare child effects in the “children” tag.  Or the effects would be treated as component declaration instead of child effects.
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