What is __AS3__.vec.Vector

Is there a defined value to "underscoreunderscoreAS3underscoreunderscore"开发者_如何学运维 in the Flash compiler? The IDE is saying that underscoreunderscoreAS3underscoreunderscore.vec.Vector cannot be imported. Is there documentation about doing these type of imports?

Vector is a FP10 class

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You don't have to import the vector class. it's a top level class. check for a typo: here is a tutorial to create a vector instance. Creating a Vector instance

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It is a bug in Flash Builder apparently

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It is not a bug just check the target of the flash player version and choose latest version.