While Flex provides you with a designated component for loading and communicating with external SWF files,
when you work in Flash - you are not that lucky.
In AS2, you could load an external SWF into a MovieClip and then target it using that MovieClip instance.
In AS3 however, things are not that easy: External SWF files are loaded using the Loader Class,
and in order to get access to their timeline - you must get a reference to that loader's contentLoaderInfo property.
Take a look at this example:
You can download the source here.
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